Greatest Common Factor of 20, 28, 40, 817

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

• Greatest Common Factor of 20, 28, 40, 817 by common division method
• Greatest Common Factor of 20, 28, 40, 817 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 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Factors of 40

List of positive integer factors of 40 that divides 40 without a remainder.

1,2,4,5,8,10,20,40

Factors of 817

List of positive integer factors of 817 that divides 817 without a remainder.

1,19,43,817

Greatest Common Factor

We found the factors 20,28,40,817 . The biggest common factor number is the GCF number.
So the greatest common factor 20,28,40,817 is 1.

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

• GCF of 49, 85, 65, 481
• GCF of 17, 79, 24, 581
• GCF of 20, 94, 16, 302
• GCF of 66, 35, 95, 646
• GCF of 42, 19, 68, 486

1. What is the GCF of 20, 28, 40, 817?

Answer: GCF of 20, 28, 40, 817 is 1.

2. How to Find the GCF of 20, 28, 40, 817

Answer: Greatest Common Factor(GCF) of 20, 28, 40, 817 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 28, 40, 817) = 1.