abundant number

noun1

1. •
   A number that is less than the sum of its proper divisors (all divisors except the number itself).

   • The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30, and 1 + 2 + 3 + 5 + 6 + 10 + 15 = 42, which is greater than 30, so 30 is an abundant number.