A natural number whose sum of true divisors is equal to itself is called

perfect number

(Perfect

Number), also known as perfect number or perfect number. List the divisor of a number, remove the number itself, and the rest is its true divisor.

The sum of all the factors of a number (excluding itself, that is, the true factor) is equal to it, and this number is called a perfect number. For example, the true factor of 6 is 1, 2,3,6 =1+2+3, so 6 is a perfect number.

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