Divisors of 840: All 32 Factors

Divisors (Factors) Calculator

Use the calculator above to find all divisors (also called factors) of any positive integer up to 4,782,969. Beyond the divisor list, this tool also shows divisor pairs, the sum and count of divisors, prime factorization, and number properties (prime, perfect square, perfect number).

All Divisors of 840

The number 840 has 32 divisors:

1,  2,  3,  4,  5,  6,  7,  8,  10,  12,  14,  15,  20,  21,  24,  28,  30,  35,  40,  42,  56,  60,  70,  84,  105,  120,  140,  168,  210,  280,  420,  840

Divisor Pairs of 840

Each pair multiplies to 840:

Number of Divisors

The number 840 has 32 divisors, written as τ(840) = 32 in number theory.

Sum of Divisors

σ(840) = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 10 + 12 + 14 + 15 + 20 + 21 + 24 + 28 + 30 + 35 + 40 + 42 + 56 + 60 + 70 + 84 + 105 + 120 + 140 + 168 + 210 + 280 + 420 + 840 = 2880

Prime Factorization of 840

See the full prime factorization calculator →

Properties of 840

• 840 is composite.
• 840 is not a perfect square.
• Number of divisors: 32.
• Sum of divisors: 2880.

Common Divisors with Another Number?

Looking for the divisors that 840 shares with another number? Use our Greatest Common Factor (GCF) calculator — it finds all common divisors and the largest one.

Step-by-Step: How to Find the Divisors of 840

An efficient way to find divisors uses the complementary pair trick: check each integer i from 1 to √840 ≈ 28.98. If i divides 840, then both i and 840/i are divisors.

1. 1 divides 840 (840 ÷ 1 = 840) → pair (1, 840)
2. 2 divides 840 (840 ÷ 2 = 420) → pair (2, 420)
3. 3 divides 840 (840 ÷ 3 = 280) → pair (3, 280)
4. 4 divides 840 (840 ÷ 4 = 210) → pair (4, 210)
5. 5 divides 840 (840 ÷ 5 = 168) → pair (5, 168)
6. 6 divides 840 (840 ÷ 6 = 140) → pair (6, 140)
7. 7 divides 840 (840 ÷ 7 = 120) → pair (7, 120)
8. 8 divides 840 (840 ÷ 8 = 105) → pair (8, 105)
9. 10 divides 840 (840 ÷ 10 = 84) → pair (10, 84)
10. 12 divides 840 (840 ÷ 12 = 70) → pair (12, 70)
11. 14 divides 840 (840 ÷ 14 = 60) → pair (14, 60)
12. 15 divides 840 (840 ÷ 15 = 56) → pair (15, 56)
13. 20 divides 840 (840 ÷ 20 = 42) → pair (20, 42)
14. 21 divides 840 (840 ÷ 21 = 40) → pair (21, 40)
15. 24 divides 840 (840 ÷ 24 = 35) → pair (24, 35)
16. 28 divides 840 (840 ÷ 28 = 30) → pair (28, 30)
17. Collect all unique values: {1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840} — total 32 divisors.
18. Sum: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 10 + 12 + 14 + 15 + 20 + 21 + 24 + 28 + 30 + 35 + 40 + 42 + 56 + 60 + 70 + 84 + 105 + 120 + 140 + 168 + 210 + 280 + 420 + 840 = 2880.

Nearby Examples

Related Operations for 840

• Multiples of 840 — "outward" complement; M is a multiple of 840 ⇔ 840 is a divisor of M
• 840 Prime Factorization — decompose into prime building blocks
• Find GCF of 840 and another number
• Find LCM of 840 and another number
• Is 840 a perfect square? (odd divisor count ⇔ yes)

See also our tables of divisors:

• Table of all divisors from 1 to 100
• Table of all divisors from 1 to 500
• Table of all divisors from 1 to 1,000
• Table of all divisors from 1 to 10,000

What Is a Divisor?

A divisor (also called a factor) of a positive integer n is any positive integer d such that n ÷ d has no remainder. In other words, d divides n evenly.

Every positive integer n has at least two divisors: 1 and n itself (with 1 being the trivial case of having only itself). Numbers with exactly 2 divisors are prime; numbers with 3 or more divisors are composite.

Why use this calculator? Beyond just listing divisors, this tool computes the sum σ(n), the count τ(n), prime factorization, divisor pairs (useful for visual learners and factoring problems), and detects whether n is a prime, a perfect square, or a perfect number.

References

• [1] Divisor (Wikipedia)
• [2] Divisor function (Wikipedia)
• [3] Divisor (Wolfram MathWorld)

Divisors Calculation Examples

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