Q: What is the sum of all factors of the number 13,640 excluding 13,640?

 A: 20,920

Why is 20,920 the sum of all factors of 13,640, excluding 13,640?

The factors of the number 13,640 are: 1, 2, 4, 5, 8, 10, 11, 20, 22, 31, 40, 44, 55, 62, 88, 110, 124, 155, 220, 248, 310, 341, 440, 620, 682, 1240, 1364, 1705, 2728, 3410, 6820, 13640.

If you add them up, you will get the total of 13,660. Now subtract 13,640 to get 20,920


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