Q: What is the sum of all factors of the number 307,840 excluding 307,840?

A: 506,120

Why is 506,120 the sum of all factors of 307,840, excluding 307,840?

The factors of the number 307,840 are: 1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 37, 40, 52, 64, 65, 74, 80, 104, 128, 130, 148, 160, 185, 208, 260, 296, 320, 370, 416, 481, 520, 592, 640, 740, 832, 962, 1040, 1184, 1480, 1664, 1924, 2080, 2368, 2405, 2960, 3848, 4160, 4736, 4810, 5920, 7696, 8320, 9620, 11840, 15392, 19240, 23680, 30784, 38480, 61568, 76960, 153920, 307840.

If you add them up, you will get the total of 308,346. Now subtract 307,840 to get 506,120