Q: What is the sum of all factors of the number 19,720 excluding 19,720?

 A: 28,880

Why is 28,880 the sum of all factors of 19,720, excluding 19,720?

The factors of the number 19,720 are: 1, 2, 4, 5, 8, 10, 17, 20, 29, 34, 40, 58, 68, 85, 116, 136, 145, 170, 232, 290, 340, 493, 580, 680, 986, 1160, 1972, 2465, 3944, 4930, 9860, 19720.

If you add them up, you will get the total of 19,748. Now subtract 19,720 to get 28,880


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