Greatest Common Factor of 23, 20, 85, 31, 21

Greatest common factor or Greatest common divisor (GCD) can be calculated in two ways

• Greatest Common Factor of 23, 20, 85, 31, 21 by common division method
• Greatest Common Factor of 23, 20, 85, 31, 21 with matching the biggest common factor

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∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 23

List of positive integer factors of 23 that divides 23 without a remainder.

1,23

Factors of 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Factors of 85

List of positive integer factors of 85 that divides 85 without a remainder.

1,5,17,85

Factors of 31

List of positive integer factors of 31 that divides 31 without a remainder.

1,31

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Greatest Common Factor

We found the factors 23,20,85,31,21 . The biggest common factor number is the GCF number.
So the greatest common factor 23,20,85,31,21 is 1.

Here are some samples of GCF of two or more Numbers calculations.

• GCF of 19, 33, 24, 56, 30
• GCF of 97, 76, 96, 50, 69
• GCF of 69, 84, 81, 49, 37
• GCF of 78, 27, 50, 63, 34
• GCF of 35, 53, 73, 63, 79

1. What is the GCF of 23, 20, 85, 31, 21?

Answer: GCF of 23, 20, 85, 31, 21 is 1.

2. How to Find the GCF of 23, 20, 85, 31, 21

Answer: Greatest Common Factor(GCF) of 23, 20, 85, 31, 21 = 1

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors GCF(23, 20, 85, 31, 21) = 1.