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No; 20 is an abundant number.

S = {1, 2, 4, 5, 10} is the set of all positive divisors of 20, excluding itself.

The sum of these divisors = 1+2+4+5+10=22 which is greater than 20.

Therefore 20 is an abundant number, not a deficient number.

When the sum exceeds the number, the number is abundant.

When the sum equals the number, the number is perfect.

When the sum is less than the number, the number is deficient.

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โˆ™ 2011-10-19 18:42:51
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Q: Is the number 20 a deficient number?
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