Greatest Common Factor of 20, 84, 21, 491

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

• Greatest Common Factor of 20, 84, 21, 491 by common division method
• Greatest Common Factor of 20, 84, 21, 491 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 20

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

1,2,4,5,10,20

Factors of 84

List of positive integer factors of 84 that divides 84 without a remainder.

1,2,3,4,6,7,12,14,21,28,42,84

Factors of 21

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

1,3,7,21

Factors of 491

List of positive integer factors of 491 that divides 491 without a remainder.

1,491

Greatest Common Factor

We found the factors 20,84,21,491 . The biggest common factor number is the GCF number.
So the greatest common factor 20,84,21,491 is 1.

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

• GCF of 51, 25, 23, 523
• GCF of 89, 72, 43, 196
• GCF of 16, 49, 23, 813
• GCF of 54, 76, 16, 245
• GCF of 79, 53, 49, 773

1. What is the GCF of 20, 84, 21, 491?

Answer: GCF of 20, 84, 21, 491 is 1.

2. How to Find the GCF of 20, 84, 21, 491

Answer: Greatest Common Factor(GCF) of 20, 84, 21, 491 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 84, 21, 491) = 1.