Q: What is the sum of all factors of the number 402,560 excluding 402,560?

A: 643,960

Why is 643,960 the sum of all factors of 402,560, excluding 402,560?

The factors of the number 402,560 are: 1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 37, 40, 64, 68, 74, 80, 85, 128, 136, 148, 160, 170, 185, 272, 296, 320, 340, 370, 544, 592, 629, 640, 680, 740, 1088, 1184, 1258, 1360, 1480, 2176, 2368, 2516, 2720, 2960, 3145, 4736, 5032, 5440, 5920, 6290, 10064, 10880, 11840, 12580, 20128, 23680, 25160, 40256, 50320, 80512, 100640, 201280, 402560.

If you add them up, you will get the total of 403,203. Now subtract 402,560 to get 643,960