Divisor Sum of 19,215

Example of Divisor Sum of Integer

 * $\map {\sigma_1} {19 \, 215} = 38 \, 688$

where $\sigma_1$ denotes the divisor sum function.

Proof
We have that:
 * $19 \, 215 = 3^2 \times 5 \times 7 \times 61$

Hence: