Q: What is the sum of all factors of the number 400,020 excluding 400,020?

A: 749,100

Why is 749,100 the sum of all factors of 400,020, excluding 400,020?

The factors of the number 400,020 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 59, 60, 113, 118, 177, 226, 236, 295, 339, 354, 452, 565, 590, 678, 708, 885, 1130, 1180, 1356, 1695, 1770, 2260, 3390, 3540, 6667, 6780, 13334, 20001, 26668, 33335, 40002, 66670, 80004, 100005, 133340, 200010, 400020.

If you add them up, you will get the total of 400,769. Now subtract 400,020 to get 749,100