Definitions for

**"Deficient number"**(4) A number in which the sum of all its proper factors is less than the number. Example: 10 is a deficient number because the sum of its proper factors is 1 + 2 + 5 = 8 and 8 is less than 10.

A number whose proper factors sum up to less than the number itself. For example, the proper factors of 10 are 1, 2, and 5, which sum to 8.

A positive integer that is larger than the sum of its proper divisors.