Greatest Common Factor of 7 and 20

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 7, 20 i.e. 1 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 7 and 20 is 1.

GCF(7,20) = 1

GCF of 7 and 20

Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;

GCF of:
and

Greatest Common Factor of 7 and 20

GCF of 7 and 20 is 1

Prime Factorization of 7


7 7
1

Prime factors of 7 are 7. Prime factorization of 7 in exponential form is:

7 = 71

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 7 and 20 is 1

Greatest Common Factor of 7 and 20 by matching factors method

Factors of 7

List of positive integer factors of 7 that divides 7 without a remainder.

1,7

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 7 and 20. The biggest common factor number is the GCF number.
So the greatest common factor 7 and 20 is 1.

Also check out the Least Common Multiple of 7 and 20

Properties of GCF 7 and 20

(i) The GCF of 7 and 20 is associative

GCF of 7 and 20 = GCF of 20 and 7

Related Greatest Common Factor of 7

Related Greatest Common Factor of 20

Frequently Asked Questions on GCF of 7 and 20

1. What is the GCF of 7 and 20?

Answer: GCF of 7 and 20 is 1.

2. What are the Factors of 7?

Answer: Factors of 7 are 1, 7. There are 2 integers that are factors of 7. The greatest factor of 7 is 7.

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 7 and 20?

Answer:

Greatest Common Factor of 7 and 20 = 1

Step 1: Find the prime factorization of 7

7 = 7

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 = = 1

Step 4: Therefore, the greatest common factor of 7 and 20 is 1