Q: What is the sum of all factors of the number 21,987 excluding 21,987?

 A: 14,413

Why is 14,413 the sum of all factors of 21,987, excluding 21,987?

The factors of the number 21,987 are: 1, 3, 7, 9, 21, 63, 349, 1047, 2443, 3141, 7329, 21987.

If you add them up, you will get the total of 22,001. Now subtract 21,987 to get 14,413


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