Q: What is the sum of all factors of the number 28,287 excluding 28,287?

 A: 18,513

Why is 18,513 the sum of all factors of 28,287, excluding 28,287?

The factors of the number 28,287 are: 1, 3, 7, 9, 21, 63, 449, 1347, 3143, 4041, 9429, 28287.

If you add them up, you will get the total of 28,305. Now subtract 28,287 to get 18,513


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