Q: What is the sum of all factors of the number 21,290,620 excluding 21,290,620?

A: 27,131,180

Why is 27,131,180 the sum of all factors of 21,290,620, excluding 21,290,620?

The factors of the number 21,290,620 are: 1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 676, 845, 1690, 3380, 6299, 12598, 25196, 31495, 62990, 81887, 125980, 163774, 327548, 409435, 818870, 1064531, 1637740, 2129062, 4258124, 5322655, 10645310, 21290620.

If you add them up, you will get the total of 21,290,647. Now subtract 21,290,620 to get 27,131,180