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If that second 24 was supposed to be a 28, choose that one.

Q: Which of the numbers 20 24 24 and 32 is also a perfect number?

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20 is a not perfect square.

149162536496481100121144169196225256289324361400------------The above numbers are squares not perfect numbers. A perfect number n is one that is equal to the proper divisors of n. Here are the first few:628496812833550336858986905613743869132823058430081399521282658455991569831744654692615953842176191561942608236107294793378084303638130997321548169216I don't know if more of them are known. For more information see oeis.org.

28 is a perfect number.

Just 6

20 is both rational and natural. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

Related questions

No. In the first hundred numbers, there are only two perfect numbers: 6, and 28.

The only perfect number between 20 and 50 is 28.

There are no perfect numbers between 20 and 30. Perfect numbers are numbers that are equal to the sum of their proper divisors, excluding the number itself. The perfect numbers within this range would be 28, but that is incorrect as 28 is not a perfect number.

No. Square numbers (or perfect square numbers) are squares of integers. The perfect square numbers are 1, 4, 9, 16, 25, 36 ... 20 is not in the series.

360

There are 11 numbers from 10 to 20 if we include 10 and 20. Of those, only 16 is a perfect square. So the probability if 1/11 or .09 repeating.

20 is a not perfect square.

149162536496481100121144169196225256289324361400------------The above numbers are squares not perfect numbers. A perfect number n is one that is equal to the proper divisors of n. Here are the first few:628496812833550336858986905613743869132823058430081399521282658455991569831744654692615953842176191561942608236107294793378084303638130997321548169216I don't know if more of them are known. For more information see oeis.org.

12,14,15,16,18note 20 is also compistive number.

28 is a perfect number.

20 is a not perfect square.

No it is not. The closest perfect number to it is 28. The divisors of 20 are 1,2,4,5,10 those add up to more than 20 so 20 is an abundant number.