Factors of 820
The factors of 820 are 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820. It has 12 factors.
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 820 is a whole number that divides it with nothing left over. You only need to test the numbers up to √820 ≈ 28.64; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 12 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: 1 + 2 + 4 + 5 + 10 + 20 + 41 + 82 + 164 + 205 + 410 + 820 = 1764. Without 820 itself that is 944, so 820 is an abundant number.
LaTeX source of the formulas on this page
\[ 820 = 2^{2} \times 5 \times 41 \]Factor pairs of 820
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 820 | 1 × 820 = 820 |
| 2 | 410 | 2 × 410 = 820 |
| 4 | 205 | 4 × 205 = 820 |
| 5 | 164 | 5 × 164 = 820 |
| 10 | 82 | 10 × 82 = 820 |
| 20 | 41 | 20 × 41 = 820 |
Questions
What are the factors of 820?
The factors of 820 are 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820. It has 12 factors.
What are the prime factors of 820?
2, 5, 41. As a product: × 5 × 41.
How many factors does 820 have?
820 has 12 factors (6 factor pairs).
What is the sum of the factors of 820?
1764.
Is 820 a prime number?
No. It is divisible by 2, so 820 = 2 × 410.