Greatest Common Factor of 20, 21, 87, 663

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

• Greatest Common Factor of 20, 21, 87, 663 by common division method
• Greatest Common Factor of 20, 21, 87, 663 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 21

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

1,3,7,21

Factors of 87

List of positive integer factors of 87 that divides 87 without a remainder.

1,3,29,87

Factors of 663

List of positive integer factors of 663 that divides 663 without a remainder.

1,3,13,17,39,51,221,663

Greatest Common Factor

We found the factors 20,21,87,663 . The biggest common factor number is the GCF number.
So the greatest common factor 20,21,87,663 is 1.

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

• GCF of 78, 60, 75, 734
• GCF of 57, 10, 55, 779
• GCF of 48, 53, 27, 773
• GCF of 94, 41, 31, 150
• GCF of 14, 58, 29, 287

1. What is the GCF of 20, 21, 87, 663?

Answer: GCF of 20, 21, 87, 663 is 1.

2. How to Find the GCF of 20, 21, 87, 663

Answer: Greatest Common Factor(GCF) of 20, 21, 87, 663 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 21, 87, 663) = 1.