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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 else can I help you with?
How many perfect numbers are in between 20 and 50?
The only perfect number between 20 and 50 is 28.
How many perfect square numbers between 1 to 1000 are?
There are 31 perfect square numbers between 1 and 1000 (including 1).
How many odd numbers are between 20 and 158?
There are 69 odd numbers between 20 and 158.
How many perfect squares are there between 20 and 150?
To find the perfect squares between 20 and 150, we need to determine the perfect squares less than 20 and the perfect squares greater than 150. The perfect squares less than 20 are 1, 4, 9, and 16. The perfect squares greater than 150 are 169 and 196. Therefore, there are 5 perfect squares between 20 and 150: 25, 36, 49, 64, and 81.
What are 4 perfect square numbers between 20 and 70?
25, 36, 49, 64
How many perfect numbers are in between 20 and 50?
The only perfect number between 20 and 50 is 28.
How many numbers between 2 and 20 are perfect squares?
Three numbers.
What are the perfect numbers between 1 and 20?
Just 6
Perfect numbers between 20 and 30?
there are no perfect numbers instead there are perfect cubes, perfect squares, natural numbers, whole numbers, integers, rational numbers, irrational numbers, and real numbers. If you want natural no. they are 21, 22, 23, 24, 25, 26, 27, 28, and 29.
How many perfect square numbers between 1 to 1000 are?
There are 31 perfect square numbers between 1 and 1000 (including 1).
How many numbers between 20 and 30 are perfect square?
4
What are the two numbers between 5 and 20 that are almost perfect.?
The two numbers between 5 and 20 that are almost perfect are 6 and 28. An almost perfect number is a number that equals the sum of its proper divisors, excluding itself. The proper divisors of 6 are 1, 2, and 3, which sum up to 6. Similarly, the proper divisors of 28 are 1, 2, 4, 7, and 14, which sum up to 28.
What are all the perfect numbers between 20 and 30?
only 28 bro
What are 2 perfect numbers between 5 and 20?
The only two are 9 and 16.
Is 20 a perfect number in math?
No. In the first hundred numbers, there are only two perfect numbers: 6, and 28.
Is 20 a square number or not?
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.
What are the ratings and certificates for Even Stevens - 1999 Almost Perfect 1-20?
Even Stevens - 1999 Almost Perfect 1-20 is rated/received certificates of: Australia:G
