The prime factors of 20 are 2x2x5.
NO!!!! Other than '2' all prime numbers are odd numbers. 4,6,10 & 20 are all even so they are not prime numbers.
All the numbers from 2 to 19 are multiples of prime numbers.
All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
The numbers 11, 13, 17 and 19 are prime.
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The prime numbers from 1 - 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
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.
These are the prime numbers 1-20 2,3,5,7,11,13,17,19
2,3,5,7,11,13,17,19
11,13,17,19
2,3,5,7,11,13,17,19