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Is 660 a perfect number? [SOLVED]

Answer

660 is not perfect because:

1 + 2 + 3 + 4 + 5 + 6 + 10 + 11 + 12 + 15 + 20 + 22 + 30 + 33 + 44 + 55 + 60 + 66 + 110 + 132 + 165 + 220 + 330 ≠ 660
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