Definitions for "Deficient number"
Keywords:  divisors, integer, proper, nbsp, sum
(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.