Greatest Common Factor of 20, 21, 128

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

• Greatest Common Factor of 20, 21, 128 by common division method
• Greatest Common Factor of 20, 21, 128 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 128

List of positive integer factors of 128 that divides 128 without a remainder.

1,2,4,8,16,32,64,128

Greatest Common Factor

We found the factors 20,21,128 . The biggest common factor number is the GCF number.
So the greatest common factor 20,21,128 is 1.

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

• GCF of 38, 30, 179
• GCF of 29, 25, 803
• GCF of 78, 46, 808
• GCF of 63, 91, 832
• GCF of 54, 69, 297

1. What is the GCF of 20, 21, 128?

Answer: GCF of 20, 21, 128 is 1.

2. How to Find the GCF of 20, 21, 128

Answer: Greatest Common Factor(GCF) of 20, 21, 128 = 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, 128) = 1.