Can't you just call it perfect?
We define a positive integer as a flawless number if is it equal to the sum of all the positive divisors less than itself.
For example, all the positive divisors of 6 are 1, 2, 3, 6. So, 6 is a flawless number because the sum of all the positive divisors less than 6 is itself!
What is the smallest flawless number that is larger than 6?
The answer is 28.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
If 2 n − 1 is prime then ( 2 n − 1 ) ( 2 n − 1 ) is a flawless number (usually called perfect number ).