Q: What is the sum of all factors of the number 21,540 excluding 21,540?

 A: 38,940

Why is 38,940 the sum of all factors of 21,540, excluding 21,540?

The factors of the number 21,540 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 359, 718, 1077, 1436, 1795, 2154, 3590, 4308, 5385, 7180, 10770, 21540.

If you add them up, you will get the total of 21,578. Now subtract 21,540 to get 38,940


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