Divisor Sum of 31,815

Example of Divisor Sum of Integer

 * $\map {\sigma_1} {31 \, 815} = 63 \, 648$

where $\sigma_1$ denotes the divisor sum function.

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

Hence: