Q: What is the sum of all factors of the number 20,909 excluding 20,909?

 A: 4,051

Why is 4,051 the sum of all factors of 20,909, excluding 20,909?

The factors of the number 20,909 are: 1, 7, 29, 103, 203, 721, 2987, 20909.

If you add them up, you will get the total of 20,913. Now subtract 20,909 to get 4,051


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