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The only two are 9 and 16.

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Q: What are 2 perfect numbers between 5 and 20?
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Related questions

How many numbers between 2 and 20 are perfect squares?

Three numbers.


How many numbers between 10 and 20 are perfect squares?

Only one - 16


What are 2 almost perfect numbers between 5 and 20?

Perfect numbers are numbers where all the factors add to that number. For example 6's factors are 1,2, and 3 and 1+2+3=6. Therefore the next perfect number isn't until 28 which is 1,2, 4, 7, 14 where 1+2+4+7+14= 28 An almost perfect number is a number which, when adding all of its proper divisors (all divisors except himself), gives you one less, or one more then the number itlself. Up to now all known almost perfect numbers are 2^n. So to answer your question, the 2 almost perfect numbers between 5 and 20 are 8 and 16. Divisors of 8: 1,2,4 -----> 1+2+4=7 Divisors of 16: 1,2,4,8 -----> 1+2+4+8=15


What is the difference between the two odd numbers right after 20?

The difference is 2. (23 - 21 = 2).If we are talking about two odd numbers that come right after the number 20 then we mean the two consecutive odd numbers after 20.The difference between any consecutive odd numbers (or between any consecutive even numbers) is always 2.


Which of the numbers between 2 and 20 are not rectangular numbers?

The prime numbers and the squares of primes between 2 and 20: 3, 4, 5, 7, 9, 11, 13, 17 and 19.


Set of odds numbers divisible by 5 between 10 and 20?

Set of odds numbers divisible by 5 between 10 and 20?


How many numbers between 20 and 50 end 2 or 5?

six numbers


How many prime numbers between 1 and 20?

There are 8 prime numbers between 1 and 20. The numbers are 2, 3, 5, 7, 11, 13, 17, and 19.


What are the prime numbers between 0 and 20?

The prime numbers between 0 and 20 are: 2, 3, 5, 7, 11, 13, 17 and 19


What are all the perfect numbers 1 - 300?

-299


What numbers between 1 and 20 are factors of 20?

1, 2, 4, 5, 10, 20


How many of the numbers from 1 to 20 can you express as the difference of two perfect squares?

Fifteen of them. All but numbers of the form 4n-2 = 2, 6, 10, 14, 18