# Is 20 a Prime Number?

Is 20 a prime number? If a number has only two factors, i.e. 1 and the number itself, it is known as a prime number. In contrast, composite numbers have more than two factors. By this explanation, can we answer the question - is 20 a prime number? According to the definition mentioned above, we can say * "No, 20 is not a prime number."* Now let us take a look at the detailed solution of why is 20 a prime number or a composite number?

**Is 20 a prime number? -**No**Is 20 a composite number? -**Yes**Factors of 20 -**1, 2, 4, 5, 10, 20**Prime Factors of 20 -**2, 5**Is 20 a perfect square? -**No

## Is 20 a Prime Number?

No, 20 is not a prime number. The number 20 is divisible by 1, 2, 4, 5, 10, 20. For a number to be classified as a prime number, it should have exactly two factors. Since 20 has more than two factors, i.e. 1, 2, 4, 5, 10, 20, it is not a prime number.

## Why is 20 not a Prime Number?

To understand whether 20 is prime or composite, it is important to find its factors.

**Factors of 20:** 1, 2, 4, 5, 10, 20

Since 20 has more than 2 factors, we can say that 20 is not a prime number.

## Is 20 a Composite Number?

Yes, since 20 has more than two factors i.e. 1, 2, 4, 5, 10, 20. In other words, 20 is a composite number because 20 has more than 2 factors.

**Problem Statements: **

Is 20 a Prime Number? | No |

Is 20 a Composite Number? | Yes |

Cube Root of 20 | 2.714415 |

Square of 20 | 400 |

Is 20 an Odd Number? | No |

Square Root of 20 | 4.472136 |

Multiples of 20 | 20, 40, 60, 80, 100, 120, 140, 160, 180, 200 |

Is 20 a Perfect Cube? | No |

Is 20 an Even Number? | Yes |

Is 20 a Perfect Square? | No |

**Fun Facts: **

- Prime numbers greater than 5 can be represented in the form of either 6n + 1 or 6n - 1. Example - 71 is a prime number and it can be written as 71 = 6 × 12 - 1
- Numbers X and Y are said to be coprime if they have only one common factor that is 1.
- A palindrome prime is a prime number that when read in reverse order results in the same number. Examples - 10601, 11311, 12421

**☛ Also Check: **

- Is 22 a Prime Number? - No
- Is 23 a Prime Number? - Yes
- Is 12 a Prime Number? - No
- Is 28 a Prime Number? - No
- Is 117 a Prime Number? - No
- Is 961 a Prime Number? - No
- Is 361 a Prime Number? - No
- Is 465 a Prime Number? - No