Sum of Factors Calculator

What the sum means

The divisor-sum function $sigma(n)$ adds every positive factor of $n$ .

For example, the factors of 6 are 1, 2, 3, and 6, so $sigma(6)=12$ .

Factors usually come in pairs such as $d$ and $n/d$ . That is why checking only up to $sqrt{n}$ is enough to recover the full list.

Easily find divisors of any number that leave a specific remainder.

Calculate the number of factors of any positive integer easily with our online tool.

Easily calculate the Greatest Common Divisor (GCD) of two numbers using the Euclidean Algorithm.