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Problems > Sum of Divisors

Sum of Divisors

Difficulty: 1400 3000 ms 128 MB

math number-theory

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

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