Q: What is the sum of all factors of the number 77,720 excluding 77,720?

 A: 105,880

Why is 105,880 the sum of all factors of 77,720, excluding 77,720?

The factors of the number 77,720 are: 1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 67, 116, 134, 145, 232, 268, 290, 335, 536, 580, 670, 1160, 1340, 1943, 2680, 3886, 7772, 9715, 15544, 19430, 38860, 77720.

If you add them up, you will get the total of 77,825. Now subtract 77,720 to get 105,880


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