Q: What is the sum of all factors of the number 21,640 excluding 21,640?

 A: 27,140

Why is 27,140 the sum of all factors of 21,640, excluding 21,640?

The factors of the number 21,640 are: 1, 2, 4, 5, 8, 10, 20, 40, 541, 1082, 2164, 2705, 4328, 5410, 10820, 21640.

If you add them up, you will get the total of 21,667. Now subtract 21,640 to get 27,140


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