Q: What is the sum of all factors of the number 21,128 excluding 21,128?

 A: 20,872

Why is 20,872 the sum of all factors of 21,128, excluding 21,128?

The factors of the number 21,128 are: 1, 2, 4, 8, 19, 38, 76, 139, 152, 278, 556, 1112, 2641, 5282, 10564, 21128.

If you add them up, you will get the total of 21,148. Now subtract 21,128 to get 20,872


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