What is the Greatest Common Factor of 20715 and 20730?

Greatest common factor (GCF) of 20715 and 20730 is 15.

GCF(20715,20730) = 15

We will now calculate the prime factors of 20715 and 20730, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20715 and 20730.

How to find the GCF of 20715 and 20730?

We will first find the prime factorization of 20715 and 20730. After we will calculate the factors of 20715 and 20730 and find the biggest common factor number .

Step-1: Prime Factorization of 20715

Prime factors of 20715 are 3, 5, 1381. Prime factorization of 20715 in exponential form is:

20715 = 3¹ × 5¹ × 1381¹

Step-2: Prime Factorization of 20730

Prime factors of 20730 are 2, 3, 5, 691. Prime factorization of 20730 in exponential form is:

20730 = 2¹ × 3¹ × 5¹ × 691¹

Step-3: Factors of 20715

List of positive integer factors of 20715 that divides 20715 without a remainder.

1, 3, 5, 15, 1381, 4143, 6905

Step-4: Factors of 20730

List of positive integer factors of 20730 that divides 20715 without a remainder.

1, 2, 3, 5, 6, 10, 15, 30, 691, 1382, 2073, 3455, 4146, 6910, 10365

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20715 and 20730. The biggest common factor number is the GCF number.
So the greatest common factor 20715 and 20730 is 15.

Also check out the Least Common Multiple of 20715 and 20730