What is the Greatest Common Factor of 12690 and 12705?

Greatest common factor (GCF) of 12690 and 12705 is 15.

GCF(12690,12705) = 15

We will now calculate the prime factors of 12690 and 12705, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12690 and 12705.

How to find the GCF of 12690 and 12705?

We will first find the prime factorization of 12690 and 12705. After we will calculate the factors of 12690 and 12705 and find the biggest common factor number .

Step-1: Prime Factorization of 12690

Prime factors of 12690 are 2, 3, 5, 47. Prime factorization of 12690 in exponential form is:

12690 = 2¹ × 3³ × 5¹ × 47¹

Step-2: Prime Factorization of 12705

Prime factors of 12705 are 3, 5, 7, 11. Prime factorization of 12705 in exponential form is:

12705 = 3¹ × 5¹ × 7¹ × 11²

Step-3: Factors of 12690

List of positive integer factors of 12690 that divides 12690 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 47, 54, 90, 94, 135, 141, 235, 270, 282, 423, 470, 705, 846, 1269, 1410, 2115, 2538, 4230, 6345

Step-4: Factors of 12705

List of positive integer factors of 12705 that divides 12690 without a remainder.

1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 121, 165, 231, 363, 385, 605, 847, 1155, 1815, 2541, 4235

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 12690 and 12705. The biggest common factor number is the GCF number.
So the greatest common factor 12690 and 12705 is 15.

Also check out the Least Common Multiple of 12690 and 12705