What is the Greatest Common Factor of 19990 and 19999?

Greatest common factor (GCF) of 19990 and 19999 is 1.

GCF(19990,19999) = 1

We will now calculate the prime factors of 19990 and 19999, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19990 and 19999.

How to find the GCF of 19990 and 19999?

We will first find the prime factorization of 19990 and 19999. After we will calculate the factors of 19990 and 19999 and find the biggest common factor number .

Step-1: Prime Factorization of 19990

Prime factors of 19990 are 2, 5, 1999. Prime factorization of 19990 in exponential form is:

19990 = 2¹ × 5¹ × 1999¹

Step-2: Prime Factorization of 19999

Prime factors of 19999 are 7, 2857. Prime factorization of 19999 in exponential form is:

19999 = 7¹ × 2857¹

Step-3: Factors of 19990

List of positive integer factors of 19990 that divides 19990 without a remainder.

1, 2, 5, 10, 1999, 3998, 9995

Step-4: Factors of 19999

List of positive integer factors of 19999 that divides 19990 without a remainder.

1, 7, 2857

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19990 and 19999. The biggest common factor number is the GCF number.
So the greatest common factor 19990 and 19999 is 1.

Also check out the Least Common Multiple of 19990 and 19999