Greatest Common Factor of 18, 20, 23, 991

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

• Greatest Common Factor of 18, 20, 23, 991 by common division method
• Greatest Common Factor of 18, 20, 23, 991 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 18

List of positive integer factors of 18 that divides 18 without a remainder.

1,2,3,6,9,18

Factors of 20

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

1,2,4,5,10,20

Factors of 23

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

1,23

Factors of 991

List of positive integer factors of 991 that divides 991 without a remainder.

1,991

Greatest Common Factor

We found the factors 18,20,23,991 . The biggest common factor number is the GCF number.
So the greatest common factor 18,20,23,991 is 1.

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

• GCF of 27, 39, 45, 163
• GCF of 20, 77, 38, 292
• GCF of 71, 81, 17, 507
• GCF of 38, 55, 88, 969
• GCF of 52, 47, 31, 659

1. What is the GCF of 18, 20, 23, 991?

Answer: GCF of 18, 20, 23, 991 is 1.

2. How to Find the GCF of 18, 20, 23, 991

Answer: Greatest Common Factor(GCF) of 18, 20, 23, 991 = 1

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

Step 2: Then multiply all the prime factors GCF(18, 20, 23, 991) = 1.