What is the Greatest Common Factor of 21618 and 21636?

Greatest common factor (GCF) of 21618 and 21636 is 18.

GCF(21618,21636) = 18

We will now calculate the prime factors of 21618 and 21636, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21618 and 21636.

How to find the GCF of 21618 and 21636?

We will first find the prime factorization of 21618 and 21636. After we will calculate the factors of 21618 and 21636 and find the biggest common factor number .

Step-1: Prime Factorization of 21618

Prime factors of 21618 are 2, 3, 1201. Prime factorization of 21618 in exponential form is:

21618 = 2¹ × 3² × 1201¹

Step-2: Prime Factorization of 21636

Prime factors of 21636 are 2, 3, 601. Prime factorization of 21636 in exponential form is:

21636 = 2² × 3² × 601¹

Step-3: Factors of 21618

List of positive integer factors of 21618 that divides 21618 without a remainder.

1, 2, 3, 6, 9, 18, 1201, 2402, 3603, 7206, 10809

Step-4: Factors of 21636

List of positive integer factors of 21636 that divides 21618 without a remainder.

1, 2, 3, 4, 6, 9, 12, 18, 36, 601, 1202, 1803, 2404, 3606, 5409, 7212, 10818

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21618 and 21636. The biggest common factor number is the GCF number.
So the greatest common factor 21618 and 21636 is 18.

Also check out the Least Common Multiple of 21618 and 21636