Q: What is the sum of all factors of the number 309,840 excluding 309,840?

A: 651,408

Why is 651,408 the sum of all factors of 309,840, excluding 309,840?

The factors of the number 309,840 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 240, 1291, 2582, 3873, 5164, 6455, 7746, 10328, 12910, 15492, 19365, 20656, 25820, 30984, 38730, 51640, 61968, 77460, 103280, 154920, 309840.

If you add them up, you will get the total of 310,491. Now subtract 309,840 to get 651,408