Created By : Jatin Gogia
Reviewed By : Rajasekhar Valipishetty
Last Updated : Apr 06, 2023
Make use of GCF Calculator to quickly find the Greatest Common Factor of numbers 16, 20 i.e. 4 largest integer by which both the numbers can be divided.
Greatest common factor (GCF) of 16 and 20 is 4.
GCF(16,20) = 4
Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;
Prime Factorization of 16
2 | 16 |
2 | 8 |
2 | 4 |
2 | 2 |
1 |
Prime factors of 16 are 2. Prime factorization of 16 in exponential form is:
16 = 24
Prime Factorization of 20
2 | 20 |
2 | 10 |
5 | 5 |
1 |
Prime factors of 20 are 2.Prime factorization of 20 in exponential form is:
20 = 22×51
∴ So by taking common prime factors GCF of 16 and 20 is 4
Factors of 16
List of positive integer factors of 16 that divides 16 without a remainder.
1,2,4,8,16
Factors of 20
List of positive integer factors of 20 that divides 20 without a remainder.
1,2,4,5,10,20
Greatest Common Factor
We found the factors and prime factorization of 16 and 20. The biggest common factor number is the GCF number.
So the greatest common factor 16 and 20 is 4.
Also check out the Least Common Multiple of 16 and 20
(i) The GCF of 16 and 20 is associative
GCF of 16 and 20 = GCF of 20 and 16
1. What is the GCF of 16 and 20?
Answer: GCF of 16 and 20 is 4.
2. What are the Factors of 16?
Answer: Factors of 16 are 1, 2, 4, 8, 16. There are 5 integers that are factors of 16. The greatest factor of 16 is 16.
3. What are the Factors of 20?
Answer: Factors of 20 are 1, 2, 4, 5, 10, 20. There are 6 integers that are factors of 20. The greatest factor of 20 is 20.
4. How to Find the GCF of 16 and 20?
Answer:
Greatest Common Factor of 16 and 20 = 4
Step 1: Find the prime factorization of 16
16 = 2 x 2 x 2 x 2
Step 2: Find the prime factorization of 20
20 = 2 x 2 x 5
Step 3: Multiply those factors both numbers have in common in steps i) or ii) above to find the gcf:
GCF = 2 x 2 = 4
Step 4: Therefore, the greatest common factor of 16 and 20 is 4