Sum of Divisors
Print the sum of all positive divisors of N (including 1 and N).
Input: one integer N.
Output: σ(N), the divisor sum.
Constraints:
- 1 ≤ N ≤ 1012
Sample Tests
Input 1
12
Output 1
28
Input 2
1
Output 2
1
Discussion (opens after you solve — no spoilers before)
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