Divisor Sum of 1,857,437,604

Example of Sigma Function of Integer

 * $\sigma \left({1 \, 857 \, 437 \, 604}\right) = 5 \, 168 \, 743 \, 489$

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

Proof
From Sigma Function of Integer
 * $\displaystyle \sigma \left({n}\right) = \prod_{1 \mathop \le i \mathop \le r} \frac {p_i^{k_i + 1} - 1} {p_i - 1}$

where $n = \displaystyle \prod_{1 \mathop \le i \mathop \le r} p_i^{k_i}$ denotes the prime decomposition of $n$.

We have that:
 * $1 \, 857 \, 437 \, 604 = 2^2 \times 3^2 \times 11^2 \times 653^2$

Hence: