Q: What is the sum of all factors of the number 421,400 excluding 421,400?

A: 744,820

Why is 744,820 the sum of all factors of 421,400, excluding 421,400?

The factors of the number 421,400 are: 1, 2, 4, 5, 7, 8, 10, 14, 20, 25, 28, 35, 40, 43, 49, 50, 56, 70, 86, 98, 100, 140, 172, 175, 196, 200, 215, 245, 280, 301, 344, 350, 392, 430, 490, 602, 700, 860, 980, 1075, 1204, 1225, 1400, 1505, 1720, 1960, 2107, 2150, 2408, 2450, 3010, 4214, 4300, 4900, 6020, 7525, 8428, 8600, 9800, 10535, 12040, 15050, 16856, 21070, 30100, 42140, 52675, 60200, 84280, 105350, 210700, 421400.

If you add them up, you will get the total of 422,144. Now subtract 421,400 to get 744,820