Why is 1,620 the sum of all factors of 680, including 680?
The factors of the number 680 are: 1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680.
If you add them up, you will get the total of 1,620.
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