Divisor Sum of 31,815

Example of Sigma Function of Integer

 * $\sigma \left({31 \, 815}\right) = 63 \, 648$

where $\sigma$ denotes the $\sigma$ function.

Proof
We have that:
 * $31 \, 815 = 3^2 \times 5 \times 7 \times 101$

Hence: