Greatest Common Factor of 21, 73, 31, 689

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

• Greatest Common Factor of 21, 73, 31, 689 by common division method
• Greatest Common Factor of 21, 73, 31, 689 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 21

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

1,3,7,21

Factors of 73

List of positive integer factors of 73 that divides 73 without a remainder.

1,73

Factors of 31

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

1,31

Factors of 689

List of positive integer factors of 689 that divides 689 without a remainder.

1,13,53,689

Greatest Common Factor

We found the factors 21,73,31,689 . The biggest common factor number is the GCF number.
So the greatest common factor 21,73,31,689 is 1.

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

• GCF of 84, 48, 13, 761
• GCF of 96, 22, 40, 498
• GCF of 12, 24, 43, 941
• GCF of 21, 91, 29, 898
• GCF of 66, 52, 86, 648

1. What is the GCF of 21, 73, 31, 689?

Answer: GCF of 21, 73, 31, 689 is 1.

2. How to Find the GCF of 21, 73, 31, 689

Answer: Greatest Common Factor(GCF) of 21, 73, 31, 689 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 73, 31, 689) = 1.