What is the Greatest Common Factor of 20917 and 20930?

Greatest common factor (GCF) of 20917 and 20930 is 13.

GCF(20917,20930) = 13

We will now calculate the prime factors of 20917 and 20930, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20917 and 20930.

How to find the GCF of 20917 and 20930?

We will first find the prime factorization of 20917 and 20930. After we will calculate the factors of 20917 and 20930 and find the biggest common factor number .

Step-1: Prime Factorization of 20917

Prime factors of 20917 are 13, 1609. Prime factorization of 20917 in exponential form is:

20917 = 13¹ × 1609¹

Step-2: Prime Factorization of 20930

Prime factors of 20930 are 2, 5, 7, 13, 23. Prime factorization of 20930 in exponential form is:

20930 = 2¹ × 5¹ × 7¹ × 13¹ × 23¹

Step-3: Factors of 20917

List of positive integer factors of 20917 that divides 20917 without a remainder.

1, 13, 1609

Step-4: Factors of 20930

List of positive integer factors of 20930 that divides 20917 without a remainder.

1, 2, 5, 7, 10, 13, 14, 23, 26, 35, 46, 65, 70, 91, 115, 130, 161, 182, 230, 299, 322, 455, 598, 805, 910, 1495, 1610, 2093, 2990, 4186, 10465

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20917 and 20930. The biggest common factor number is the GCF number.
So the greatest common factor 20917 and 20930 is 13.

Also check out the Least Common Multiple of 20917 and 20930