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.

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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.

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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:

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