what is complete number?
Complete numbers: A positive number is said to be complete if the sum of all positive divisors of the number is equal to twice the number itself. For example, 6 is the first positive complete number. The divisors of 6 are 1, 2, 3 and 6. Therefore, the sum of the divisors = 1 + 2 + 3 + 6 = 12 = 2 × 6.
