What is the Least Common Multiple of 21638 and 21647?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 21638 and 21647 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21638 and 21647, than apply into the LCM equation.

GCF(21638,21647) = 1
LCM(21638,21647) = ( 21638 × 21647) / 1
LCM(21638,21647) = 468397786 / 1
LCM(21638,21647) = 468397786

Least Common Multiple (LCM) of 21638 and 21647 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21638 and 21647. First we will calculate the prime factors of 21638 and 21647.

Prime Factorization of 21638

Prime Factorization of 21647

Now multiplying the highest exponent prime factors to calculate the LCM of 21638 and 21647.

LCM(21638,21647) = 2¹ × 31¹ × 349¹ × 21647¹
LCM(21638,21647) = 468397786