Mathematics

Ernesto Crosby

23 May, 12:15

Every integer is a divisor of itself. A proper divisor of an integer means a positive divisor other than the integer itself. For example, the divisors of $8$ are $1,$ $2,$ $4,$ and $8,$ but the proper divisors of $8$ are just $1,$ $2,$ and $4$.

What is the smallest positive integer whose proper divisors add up to more than the integer itself?