# Is 20 Prime Number or Composite Number

Created by: Team Maths - Examples.com, Last Updated: May 7, 2024

## Is 20 a Prime Number?

### No – 20 is not a Prime Number.

Why No: 20 is not a prime number because it does not meet the prime criteria of having exactly two distinct positive divisors: 1 and itself.  See Prime number checker.

## Is 20 a Composite Number?

### Yes – 20 is a Composite Number.

Why Yes: 20 is a composite number because it has more than two distinct positive divisors. It has 1, 2, 4, 5, 10, and itself (20).

## Problem Statements

Is 20 a prime number? No
Is 20 a composite number? Yes
Is 20 a perfect square? No
Factors of 20 1, 2, 4, 5, 10, 20
Multiples of 20 20, 40, 60, 80, 100, 120, 140, 160, 180, 200
Cube Root of 20 2.71
Square of 20 400
Square Root of 20 4.47
Is 20 a Perfect Square? No
Is 20 a Perfect Cube? No
Is 20 an Irrational number No
Is 20 a Rational number Yes
Is 20 a Real number Yes
Is 20 an Integer Yes
Is 20 a Natural number Yes
Is 20 a Whole number Yes
Is 20 an Even or odd number Yes (20 is an even number)
Is 20 an Ordinal number Yes
Is 20 a Complex number Yes (as all real numbers are also complex numbers)

## What are the factors of 20?

The factors of 20 are 1, 2, 4, 5, 10, and 20. 20 is not a prime number because it is divisible by numbers other than 1 and itself, highlighting its composite nature. There are multiple factors of 20, making it clear that it is not a prime number.

## What Kind of Number is 20?

• 20 is a composite number.
• 20 is one of the even numbers; it is an even number.
• 20 is considered significant in various cultures, often associated with a base counting system.
• 20 is a natural number.
• 20 is a positive integer.
• 20 is a composite number.
• 20 is an even number.
• 20 is a rational number.
• 20 is a whole number.

20 is recognized as a composite number because it has more than two divisors: 1, 2, 4, 5, 10, and itself (20). This characteristic distinguishes it from prime numbers, which have exactly two divisors. The number 20, while it may hold significance in some cultural or numerical systems (such as being the basis for the vicesimal counting system in some cultures), is primarily noted in mathematics for its composite status. Its properties as an even, composite, and natural number make it a fundamental figure in various mathematical and conceptual frameworks.

## Is 20 an even composite number?

Yes, 20 is an even composite number. It has multiple divisors (1, 2, 4, 5, 10, 20) and is divisible by 2, fitting the definitions of both even and composite.

## Is every number in the 20 composite?

Not every number in the 20s is composite. For example, 23 and 29 are prime numbers, having only two divisors: 1 and themselves.

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