There is no way to determine the amount of perfect numbers there are. The number could be infinite, but this has yet to be proven. It has also yet to be proven if there are any odd perfect numbers.
There are 31 perfect square numbers between 1 and 1000 (including 1).
6 and 28 are perfect numbers.
There are 48 different numbers that are considered to be perfect numbers. The perfect numbers that are up to 100 include 6 and 28.
The only perfect number between 20 and 50 is 28.
Infinitely many. There are a 100 perfect squares.
There are infinitely many perfect numbers so they cannot all be listed.
There are two perfect numbers, 6 and 28, that are less than 100.
Three numbers.
There are 31 perfect square numbers between 1 and 1000 (including 1).
101
25
6 and 28 are perfect numbers.
Two. 36, and 49 are perfect squares.
There are 48 different numbers that are considered to be perfect numbers. The perfect numbers that are up to 100 include 6 and 28.
4
The only perfect number between 20 and 50 is 28.
No. The only perfect numbers less than 100 are 6 and 28. All known perfect numbers are even - it is unknown whether there are odd perfect numbers.