What is the Greatest Common Factor of 20840 and 20851?

Greatest common factor (GCF) of 20840 and 20851 is 1.

GCF(20840,20851) = 1

We will now calculate the prime factors of 20840 and 20851, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20840 and 20851.

How to find the GCF of 20840 and 20851?

We will first find the prime factorization of 20840 and 20851. After we will calculate the factors of 20840 and 20851 and find the biggest common factor number .

Step-1: Prime Factorization of 20840

Prime factors of 20840 are 2, 5, 521. Prime factorization of 20840 in exponential form is:

20840 = 2³ × 5¹ × 521¹

Step-2: Prime Factorization of 20851

Prime factors of 20851 are 29, 719. Prime factorization of 20851 in exponential form is:

20851 = 29¹ × 719¹

Step-3: Factors of 20840

List of positive integer factors of 20840 that divides 20840 without a remainder.

1, 2, 4, 5, 8, 10, 20, 40, 521, 1042, 2084, 2605, 4168, 5210, 10420

Step-4: Factors of 20851

List of positive integer factors of 20851 that divides 20840 without a remainder.

1, 29, 719

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20840 and 20851. The biggest common factor number is the GCF number.
So the greatest common factor 20840 and 20851 is 1.

Also check out the Least Common Multiple of 20840 and 20851