What is the Greatest Common Factor of 15985 and 15990?

Greatest common factor (GCF) of 15985 and 15990 is 5.

GCF(15985,15990) = 5

We will now calculate the prime factors of 15985 and 15990, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15985 and 15990.

How to find the GCF of 15985 and 15990?

We will first find the prime factorization of 15985 and 15990. After we will calculate the factors of 15985 and 15990 and find the biggest common factor number .

Step-1: Prime Factorization of 15985

Prime factors of 15985 are 5, 23, 139. Prime factorization of 15985 in exponential form is:

15985 = 5¹ × 23¹ × 139¹

Step-2: Prime Factorization of 15990

Prime factors of 15990 are 2, 3, 5, 13, 41. Prime factorization of 15990 in exponential form is:

15990 = 2¹ × 3¹ × 5¹ × 13¹ × 41¹

Step-3: Factors of 15985

List of positive integer factors of 15985 that divides 15985 without a remainder.

1, 5, 23, 115, 139, 695, 3197

Step-4: Factors of 15990

List of positive integer factors of 15990 that divides 15985 without a remainder.

1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 41, 65, 78, 82, 123, 130, 195, 205, 246, 390, 410, 533, 615, 1066, 1230, 1599, 2665, 3198, 5330, 7995

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15985 and 15990. The biggest common factor number is the GCF number.
So the greatest common factor 15985 and 15990 is 5.

Also check out the Least Common Multiple of 15985 and 15990