Why is 3,960 the sum of all factors of 1,720, including 1,720?
The factors of the number 1,720 are: 1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720.
If you add them up, you will get the total of 3,960.
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