Q: What is the sum of all factors of the number 403,520 excluding 403,520?

A: 641,944

Why is 641,944 the sum of all factors of 403,520, excluding 403,520?

The factors of the number 403,520 are: 1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 97, 104, 130, 160, 194, 208, 260, 320, 388, 416, 485, 520, 776, 832, 970, 1040, 1261, 1552, 1940, 2080, 2522, 3104, 3880, 4160, 5044, 6208, 6305, 7760, 10088, 12610, 15520, 20176, 25220, 31040, 40352, 50440, 80704, 100880, 201760, 403520.

If you add them up, you will get the total of 404,161. Now subtract 403,520 to get 641,944