The only perfect number between 20 and 50 is 28.
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There are 31 perfect square numbers between 1 and 1000 (including 1).
There are 69 odd numbers between 20 and 158.
There are 40 odd numbers between 20 and 100. Remember that an odd number is every second number. There are 80 numbers between 20 and 100, so there are 40 odd numbers and 40 even numbers.
Twenty of them
six numbers