Factors of 100

2, 5. As a product: 2^2 × 5^2.

The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, 100. It has 9 factors.

Factors of 100

Pick any whole number from 1 to 10,000.

100 = 2^{2} \times 5^{2}

How to work it out

1
A factor of 100 is a whole number that divides it with nothing left over. You only need to test the numbers up to √100 ≈ 10.00; every one that divides gives a pair.
2
The factor pairs are listed in the table below. Together they give 9 factors.
3
Prime factorisation: keep dividing by the smallest prime that fits.
$100 = 2^{2} \times 5^{2}$
4
Add all the factors: 1 + 2 + 4 + 5 + 10 + 20 + 25 + 50 + 100 = 217. Without 100 itself that is 117, so 100 is an abundant number.

LaTeX source of the formulas on this page

\[ 100 = 2^{2} \times 5^{2} \]

What are the factors of 100?

The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, 100. It has 9 factors.

What are the prime factors of 100?

2, 5. As a product: $2^{2}$ × $5^{2}$ .

How many factors does 100 have?

100 has 9 factors (5 factor pairs, one of them 10 × 10).

What is the sum of the factors of 100?

217.

Is 100 a prime number?

No. It is divisible by 2, so 100 = 2 × 50.