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.
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No, 80 is a not perfect square.
They are numbers that are NEAR PERFECT. a near perfect number is when its factors (exept the actual number) are added up and ALMOST equal the number ex. 16x1/2x8/4x4/ so its factors are 1,2,4,8 and 16 so add them ( exept the actual number) 1+2+4+8=15 so its NEAR PERFECT and a perfect number is a number that all its factors equal to its number ex. 6-1,2,3,6 are its factors all together-1+2+3=6 those are NEAR PERFECT and PERFECT numbers
No, 3.6 is not a perfect square. A perfect square is defined as a number that has a whole number for a square root. In other words, there's no whole number that, when multiplied by itself, equals 3.6.
Yes, a perfect square is a number that has an integer square root.
No, a perfect square number will ALWAYS ends in 0,1,4,5,6,9