Q: What is the sum of all factors of the number 21,304,220 excluding 21,304,220?

A: 30,741,340

Why is 30,741,340 the sum of all factors of 21,304,220, excluding 21,304,220?

The factors of the number 21,304,220 are: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 21739, 43478, 86956, 108695, 152173, 217390, 304346, 434780, 608692, 760865, 1065211, 1521730, 2130422, 3043460, 4260844, 5326055, 10652110, 21304220.

If you add them up, you will get the total of 21,304,250. Now subtract 21,304,220 to get 30,741,340