Q: What is the sum of all factors of the number 19,971 excluding 19,971?

 A: 13,101

Why is 13,101 the sum of all factors of 19,971, excluding 19,971?

The factors of the number 19,971 are: 1, 3, 7, 9, 21, 63, 317, 951, 2219, 2853, 6657, 19971.

If you add them up, you will get the total of 19,984. Now subtract 19,971 to get 13,101


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