Q: What is the sum of all factors of the number 10,280 excluding 10,280?

 A: 12,940

Why is 12,940 the sum of all factors of 10,280, excluding 10,280?

The factors of the number 10,280 are: 1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2056, 2570, 5140, 10280.

If you add them up, you will get the total of 10,292. Now subtract 10,280 to get 12,940


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