Q: What is the sum of all factors of the number 421,820 excluding 421,820?

A: 642,628

Why is 642,628 the sum of all factors of 421,820, excluding 421,820?

The factors of the number 421,820 are: 1, 2, 4, 5, 7, 10, 14, 20, 23, 28, 35, 46, 70, 92, 115, 131, 140, 161, 230, 262, 322, 460, 524, 644, 655, 805, 917, 1310, 1610, 1834, 2620, 3013, 3220, 3668, 4585, 6026, 9170, 12052, 15065, 18340, 21091, 30130, 42182, 60260, 84364, 105455, 210910, 421820.

If you add them up, you will get the total of 422,462. Now subtract 421,820 to get 642,628