a number is said to be ______,
number when all its factors add up to twice that that number .
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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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Perfect number
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perfect number is the answer
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