Q: What is the sum of all factors of the number 15,880 excluding 15,880?

 A: 19,940

Why is 19,940 the sum of all factors of 15,880, excluding 15,880?

The factors of the number 15,880 are: 1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1588, 1985, 3176, 3970, 7940, 15880.

If you add them up, you will get the total of 15,899. Now subtract 15,880 to get 19,940


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