A number for which sum of all its factors is equal to twice the is called a
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perfect number....
6 : factors: 1 , 2 , 3 , 6 : sum = 12 = twice of 6
28 : factors : 1, 2, 4, 7, 14, 28 : sum = 56 twice of 28
6 : factors: 1 , 2 , 3 , 6 : sum = 12 = twice of 6
28 : factors : 1, 2, 4, 7, 14, 28 : sum = 56 twice of 28
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A number for which sum of all its factors is equal to twice the is called a perfect no ...
For example, the divisors of 28 are 1, 2, 4, 7, 14, and 28, so the sum of proper divisors is 1 + 2 + 4 + 7 + 14 = 28.
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