Q: What is the sum of all factors of the number 388,680 excluding 388,680?

A: 820,920

Why is 820,920 the sum of all factors of 388,680, excluding 388,680?

The factors of the number 388,680 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 41, 60, 79, 82, 120, 123, 158, 164, 205, 237, 246, 316, 328, 395, 410, 474, 492, 615, 632, 790, 820, 948, 984, 1185, 1230, 1580, 1640, 1896, 2370, 2460, 3160, 3239, 4740, 4920, 6478, 9480, 9717, 12956, 16195, 19434, 25912, 32390, 38868, 48585, 64780, 77736, 97170, 129560, 194340, 388680.

If you add them up, you will get the total of 389,500. Now subtract 388,680 to get 820,920