What is the Greatest Common Factor of 20390 and 20408?

Greatest common factor (GCF) of 20390 and 20408 is 2.

GCF(20390,20408) = 2

We will now calculate the prime factors of 20390 and 20408, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20390 and 20408.

How to find the GCF of 20390 and 20408?

We will first find the prime factorization of 20390 and 20408. After we will calculate the factors of 20390 and 20408 and find the biggest common factor number .

Step-1: Prime Factorization of 20390

Prime factors of 20390 are 2, 5, 2039. Prime factorization of 20390 in exponential form is:

20390 = 2¹ × 5¹ × 2039¹

Step-2: Prime Factorization of 20408

Prime factors of 20408 are 2, 2551. Prime factorization of 20408 in exponential form is:

20408 = 2³ × 2551¹

Step-3: Factors of 20390

List of positive integer factors of 20390 that divides 20390 without a remainder.

1, 2, 5, 10, 2039, 4078, 10195

Step-4: Factors of 20408

List of positive integer factors of 20408 that divides 20390 without a remainder.

1, 2, 4, 8, 2551, 5102, 10204

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20390 and 20408. The biggest common factor number is the GCF number.
So the greatest common factor 20390 and 20408 is 2.

Also check out the Least Common Multiple of 20390 and 20408