Q: What is the sum of all factors of the number 20,505 excluding 20,505?

 A: 12,327

Why is 12,327 the sum of all factors of 20,505, excluding 20,505?

The factors of the number 20,505 are: 1, 3, 5, 15, 1367, 4101, 6835, 20505.

If you add them up, you will get the total of 20,517. Now subtract 20,505 to get 12,327


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