Factors of 20 are 1, 2, 4, 5, 10 and 20. And their sum is 1 + 2 + 4 + 5 + 10 + 20 = 32.
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The sum of all integers from 1 to 20 inclusive is 210.
2 and 10. 2*10=20 2+10=12
1 and 5 are the factors of 20 which are odd.
The factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48. Their sum is 124.
The sum of the positive factors of 504 is: 1,560