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The numbers for which the sum of its proper factors is 1 less than the number is the powers of 2; less than 50 these are: 2, 4, 8, 16 & 32.

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8y ago

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Related Questions

What numbers do not include the number itself?

the proper factors are the factors of a number not including the number itself, or 1.


Do all numbers have factors?

Yes. 1 and the number itself are factors of all numbers.


What is two numbers that are factors of a number?

1 and the number itself. These two are always factors.


What numbers has only 2 factors?

Any prime number, a prime number is a number of which the only factors are it and itself.


What is the name for a whole number that has exactly to factors?

A prime number- the factors are 1 and itself. Composite numbers are numbers with more than 2 numbers.


How do you figure out prime numbers not knowing there factors?

But you do know the factors of prime numbers. Every prime number has two factors: one and the number itself.


Do prime numbers have factors?

Yes, prime numbers have factors. A prime number has only two factors(1 and itself).


Do prime numbers have an odd number of factors?

A prime number has exactly two factors, 1 and the number itself.


What are the factors of any prime numbers?

One and the number itself.


Will you get the same number of factors if you multiply a prime number and itself?

Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.


Is there a number which has no factors?

A prime numbers has no positive integer factors except itself and 1. The number 1 has only itself as a factor. The number 0 has no factors at all.


What are compossite numbers and prime numbers?

A prime number has only two factors, one and the number itself. A composite number has more than two factors.