Greatest Common Factor of 20, 49, 640

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

• Greatest Common Factor of 20, 49, 640 by common division method
• Greatest Common Factor of 20, 49, 640 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 49

List of positive integer factors of 49 that divides 49 without a remainder.

1,7,49

Factors of 640

List of positive integer factors of 640 that divides 640 without a remainder.

1,2,4,5,8,10,16,20,32,40,64,80,128,160,320,640

Greatest Common Factor

We found the factors 20,49,640 . The biggest common factor number is the GCF number.
So the greatest common factor 20,49,640 is 1.

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

• GCF of 15, 88, 206
• GCF of 23, 31, 275
• GCF of 12, 61, 911
• GCF of 48, 81, 992
• GCF of 72, 87, 334

1. What is the GCF of 20, 49, 640?

Answer: GCF of 20, 49, 640 is 1.

2. How to Find the GCF of 20, 49, 640

Answer: Greatest Common Factor(GCF) of 20, 49, 640 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 49, 640) = 1.