Q: What is the sum of all factors of the number 261,280 excluding 261,280?

A: 391,904

Why is 391,904 the sum of all factors of 261,280, excluding 261,280?

The factors of the number 261,280 are: 1, 2, 4, 5, 8, 10, 16, 20, 23, 32, 40, 46, 71, 80, 92, 115, 142, 160, 184, 230, 284, 355, 368, 460, 568, 710, 736, 920, 1136, 1420, 1633, 1840, 2272, 2840, 3266, 3680, 5680, 6532, 8165, 11360, 13064, 16330, 26128, 32660, 52256, 65320, 130640, 261280.

If you add them up, you will get the total of 261,671. Now subtract 261,280 to get 391,904