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Q: Which numbers between 20 and 30 have the least number of factors?

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At least two factors because prime numbers have two factors and composite numbers have more than two factors.

all numbers have at least two factors, 1 and the number itself

Prime numbers: 31 and 37

No, prime numbers have only two factors: 1 and itself. Composite numbers have at least 3 factors.

1 has the least factors.

1 has the fewest factors.

A prime number is a whole number that has only two distinct factors: 1 and the number itself. A composite number has at least three distinct factors.

31 and 37 each have two factors.

In a set of numbers, the difference between the greatest and the least is called the range.

Every number except the number 1 has at least two factors, 1 and the number itself. Prime numbers have exactly two factors and composite numbers have more than two factors. All even numbers except the number 2 are composite numbers and have more than two factors. The number 2 is prime and its only factors are 1 and 2.

Every number has at least two factors . . . itself, and the number ' 1 ' .If those are the only factors it has, and no others, then it's a prime number.

There is none. All the numbers have at least 1 and themselves as factors.

A single number cannot have common factors. To be common there need to be at least two numbers.

8

All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. Since every number has 1 as a factor, 1 is always the least common factor of any set of integers.

None. There are no numbers "between" a single number: you need at least two numbers to have a "between".

There cannot be common factors of just one number. To be common there need to be at least two numbers.

There cannot be common factors of just one number. To be common there need to be at least two numbers.

There cannot be common factors of just one number. To be common there need to be at least two numbers.