Divisor Sum of 13,545

Example of Sigma Function of Integer

 * $\map \sigma {13 \, 545} = 27 \, 456$

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

Proof
We have that:
 * $13 \, 545 = 3^2 \times 5 \times 7 \times 43$

Hence: