Q: What is the sum of all factors of the number 39,900 excluding 39,900?

A: 98,980

Why is 98,980 the sum of all factors of 39,900, excluding 39,900?

The factors of the number 39,900 are: 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 19, 20, 21, 25, 28, 30, 35, 38, 42, 50, 57, 60, 70, 75, 76, 84, 95, 100, 105, 114, 133, 140, 150, 175, 190, 210, 228, 266, 285, 300, 350, 380, 399, 420, 475, 525, 532, 570, 665, 700, 798, 950, 1050, 1140, 1330, 1425, 1596, 1900, 1995, 2100, 2660, 2850, 3325, 3990, 5700, 6650, 7980, 9975, 13300, 19950, 39900.

If you add them up, you will get the total of 39,998. Now subtract 39,900 to get 98,980