Greatest Common Factor of 20, 45, 21, 697

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

• Greatest Common Factor of 20, 45, 21, 697 by common division method
• Greatest Common Factor of 20, 45, 21, 697 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 45

List of positive integer factors of 45 that divides 45 without a remainder.

1,3,5,9,15,45

Factors of 21

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

1,3,7,21

Factors of 697

List of positive integer factors of 697 that divides 697 without a remainder.

1,17,41,697

Greatest Common Factor

We found the factors 20,45,21,697 . The biggest common factor number is the GCF number.
So the greatest common factor 20,45,21,697 is 1.

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

• GCF of 63, 33, 87, 730
• GCF of 78, 72, 60, 117
• GCF of 19, 70, 84, 761
• GCF of 49, 13, 47, 157
• GCF of 94, 84, 75, 941

1. What is the GCF of 20, 45, 21, 697?

Answer: GCF of 20, 45, 21, 697 is 1.

2. How to Find the GCF of 20, 45, 21, 697

Answer: Greatest Common Factor(GCF) of 20, 45, 21, 697 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 45, 21, 697) = 1.