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Q: What are all the prime numbers of 20?

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All the numbers from 2 to 19 are multiples of prime numbers.

The numbers 11, 13, 17 and 19 are prime.

All the prime numbers less than 20 are 2,3,5,7,11,13,17,19

These are the prime numbers 1-20 2,3,5,7,11,13,17,19

Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.

2,3,5,7,11,13,17,19

2,3,5,7,11,13,17,19

11,13,17,19

The prime numbers from 1 - 20 are 2, 3, 5, 7, 11, 13, 17, and 19.

All of them except 23 and 29 which are prime numbers

There are many ways to do prime factorisation for 20. It is not prime as it has more than 2 factors. The beginning of the prime factorisation is correct, but it is incomplete. These are two ways to complete it. 20 4x5 2x2x5 or 20 2x10 2x2x5 You have to continue using factorisation on all the numbers until all the numbers are prime. The prime numbers will always be the same if it starts with the same original number.

The first prime above 20 is 23, and then all others (29 is the next).

23,29,31,37,41,and 47

11,13,17 and 19

23 and 29

All composite numbers do. All prime numbers are already prime.

All of them except 23 and 29 which are prime numbers

All of them except for 23 and 29 which are prime numbers.

The prime numbers between 1 and 20 are: 2 3 5 7 11 13 17 19.

2/5 of the numbers from 1 to 20 are prime numbers

20 10,2 5,2,2

2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97 these are all the prime numbers

The prime numbers between 4 and 20 are 5, 7, 11, 13, 17 and 19. Their sum is 72.

The prime numbers of 20 are 2, 2 and 5. (2*2*5 = 20)

23 29.