Greatest Common Factor of 27, 19, 21, 561

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

• Greatest Common Factor of 27, 19, 21, 561 by common division method
• Greatest Common Factor of 27, 19, 21, 561 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 27

List of positive integer factors of 27 that divides 27 without a remainder.

1,3,9,27

Factors of 19

List of positive integer factors of 19 that divides 19 without a remainder.

1,19

Factors of 21

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

1,3,7,21

Factors of 561

List of positive integer factors of 561 that divides 561 without a remainder.

1,3,11,17,33,51,187,561

Greatest Common Factor

We found the factors 27,19,21,561 . The biggest common factor number is the GCF number.
So the greatest common factor 27,19,21,561 is 1.

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

• GCF of 39, 74, 90, 279
• GCF of 63, 71, 68, 131
• GCF of 16, 91, 27, 306
• GCF of 18, 20, 40, 753
• GCF of 52, 30, 51, 277

1. What is the GCF of 27, 19, 21, 561?

Answer: GCF of 27, 19, 21, 561 is 1.

2. How to Find the GCF of 27, 19, 21, 561

Answer: Greatest Common Factor(GCF) of 27, 19, 21, 561 = 1

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

Step 2: Then multiply all the prime factors GCF(27, 19, 21, 561) = 1.