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It isn't a perfect number.
A perfect number is a number which is the sum of its proper divisors (including 1, but excluding itself).
The divisors of 20 are 1, 2, 4, 5, 10.
1 + 2 + 4 + 5 + 10 = 22 => 20 is not a perfect number.
An example of a perfect number is 28:
The divisors of 28 are 1, 2, 4, 7, 14
1 + 2 + 4 + 7 + 14 = 28 => 28 is a perfect number.
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