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Is 3920 a perfect number? [SOLVED]

Answer


3920 is not perfect because:

1 + 2 + 4 + 5 + 7 + 8 + 10 + 14 + 16 + 20 + 28 + 35 + 40 + 49 + 56 + 70 + 80 + 98 + 112 + 140 + 196 + 245 + 280 + 392 + 490 + 560 + 784 + 980 + 1960 3920
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