A natural number is ABUNDANT if it is less than the sum of
its divisors excluding itself.
For example:
70 is an abundant number:
its divisors are
1, 2, 5, 7, 10, 14, 35.
Their sum is 74, greater than 70.
On the contrary 10 isn't an abundant number:
the sum of its divisors (1, 2, 5) is equal to 8, that is less than 10.
When a number is equal to the sum of its divisors, it is called perfect
When a number is greater than the sum of its
divisors, it is called deficient or defective.
Acknowledgment
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List of abundant numbers
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