Greatest Common Factor of 257, 390, 20

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

• Greatest Common Factor of 257, 390, 20 by common division method
• Greatest Common Factor of 257, 390, 20 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 257

List of positive integer factors of 257 that divides 257 without a remainder.

1,257

Factors of 390

List of positive integer factors of 390 that divides 390 without a remainder.

1,2,3,5,6,10,13,15,26,30,39,65,78,130,195,390

Factors of 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Greatest Common Factor

We found the factors 257,390,20 . The biggest common factor number is the GCF number.
So the greatest common factor 257,390,20 is 1.

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

• GCF of 318, 557, 19
• GCF of 592, 918, 75
• GCF of 562, 729, 85
• GCF of 792, 124, 66
• GCF of 778, 622, 57

1. What is the GCF of 257, 390, 20?

Answer: GCF of 257, 390, 20 is 1.

2. How to Find the GCF of 257, 390, 20

Answer: Greatest Common Factor(GCF) of 257, 390, 20 = 1

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

Step 2: Then multiply all the prime factors GCF(257, 390, 20) = 1.