Q: What is the sum of all factors of the number 15,720 excluding 15,720?

 A: 31,800

Why is 31,800 the sum of all factors of 15,720, excluding 15,720?

The factors of the number 15,720 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120, 131, 262, 393, 524, 655, 786, 1048, 1310, 1572, 1965, 2620, 3144, 3930, 5240, 7860, 15720.

If you add them up, you will get the total of 15,751. Now subtract 15,720 to get 31,800


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