Greatest Common Factor of 20, 21, 43, 209

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

• Greatest Common Factor of 20, 21, 43, 209 by common division method
• Greatest Common Factor of 20, 21, 43, 209 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 43

List of positive integer factors of 43 that divides 43 without a remainder.

1,43

Factors of 209

List of positive integer factors of 209 that divides 209 without a remainder.

1,11,19,209

Greatest Common Factor

We found the factors 20,21,43,209 . The biggest common factor number is the GCF number.
So the greatest common factor 20,21,43,209 is 1.

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

• GCF of 41, 88, 96, 548
• GCF of 16, 55, 38, 179
• GCF of 90, 18, 37, 866
• GCF of 18, 93, 23, 989
• GCF of 47, 51, 20, 951

1. What is the GCF of 20, 21, 43, 209?

Answer: GCF of 20, 21, 43, 209 is 1.

2. How to Find the GCF of 20, 21, 43, 209

Answer: Greatest Common Factor(GCF) of 20, 21, 43, 209 = 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, 43, 209) = 1.