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Perfect Numbers are those numbers which are equal to the sum of its proper positive divisors (excluding itself). Consider number 6, it has only four proper positive divisors 1, 2, 3 and 6. If we exclude 6, proper divisors left are 1, 2 and 3 and their sum is 6 which is equal to the number itself. So, 6 is a Perfect Number. You can also say that Perfect Number… Read more »