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Is 420 a perfect number? [SOLVED]

Answer

420 is not perfect because:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 10 + 12 + 14 + 15 + 20 + 21 + 28 + 30 + 35 + 42 + 60 + 70 + 84 + 105 + 140 + 210 ≠ 420
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