What is the Greatest Common Factor of 20709 and 20729?

Greatest common factor (GCF) of 20709 and 20729 is 1.

GCF(20709,20729) = 1

We will now calculate the prime factors of 20709 and 20729, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20709 and 20729.

How to find the GCF of 20709 and 20729?

We will first find the prime factorization of 20709 and 20729. After we will calculate the factors of 20709 and 20729 and find the biggest common factor number .

Step-1: Prime Factorization of 20709

Prime factors of 20709 are 3, 13, 59. Prime factorization of 20709 in exponential form is:

20709 = 3³ × 13¹ × 59¹

Step-2: Prime Factorization of 20729

Prime factors of 20729 are 19, 1091. Prime factorization of 20729 in exponential form is:

20729 = 19¹ × 1091¹

Step-3: Factors of 20709

List of positive integer factors of 20709 that divides 20709 without a remainder.

1, 3, 9, 13, 27, 39, 59, 117, 177, 351, 531, 767, 1593, 2301, 6903

Step-4: Factors of 20729

List of positive integer factors of 20729 that divides 20709 without a remainder.

1, 19, 1091

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20709 and 20729. The biggest common factor number is the GCF number.
So the greatest common factor 20709 and 20729 is 1.

Also check out the Least Common Multiple of 20709 and 20729