What is the Greatest Common Factor of 15840 and 15857?

Greatest common factor (GCF) of 15840 and 15857 is 1.

GCF(15840,15857) = 1

We will now calculate the prime factors of 15840 and 15857, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15840 and 15857.

How to find the GCF of 15840 and 15857?

We will first find the prime factorization of 15840 and 15857. After we will calculate the factors of 15840 and 15857 and find the biggest common factor number .

Step-1: Prime Factorization of 15840

Prime factors of 15840 are 2, 3, 5, 11. Prime factorization of 15840 in exponential form is:

15840 = 2⁵ × 3² × 5¹ × 11¹

Step-2: Prime Factorization of 15857

Prime factors of 15857 are 101, 157. Prime factorization of 15857 in exponential form is:

15857 = 101¹ × 157¹

Step-3: Factors of 15840

List of positive integer factors of 15840 that divides 15840 without a remainder.

1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 16, 18, 20, 22, 24, 30, 32, 33, 36, 40, 44, 45, 48, 55, 60, 66, 72, 80, 88, 90, 96, 99, 110, 120, 132, 144, 160, 165, 176, 180, 198, 220, 240, 264, 288, 330, 352, 360, 396, 440, 480, 495, 528, 660, 720, 792, 880, 990, 1056, 1320, 1440, 1584, 1760, 1980, 2640, 3168, 3960, 5280, 7920

Step-4: Factors of 15857

List of positive integer factors of 15857 that divides 15840 without a remainder.

1, 101, 157

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15840 and 15857. The biggest common factor number is the GCF number.
So the greatest common factor 15840 and 15857 is 1.

Also check out the Least Common Multiple of 15840 and 15857