Q: What is the sum of all factors of the number 28,815 excluding 28,815?

 A: 20,433

Why is 20,433 the sum of all factors of 28,815, excluding 28,815?

The factors of the number 28,815 are: 1, 3, 5, 15, 17, 51, 85, 113, 255, 339, 565, 1695, 1921, 5763, 9605, 28815.

If you add them up, you will get the total of 28,835. Now subtract 28,815 to get 20,433


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