What is the Least Common Multiple of 21690 and 21709?

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 21690 and 21709 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21690 and 21709, than apply into the LCM equation.

GCF(21690,21709) = 1
LCM(21690,21709) = ( 21690 × 21709) / 1
LCM(21690,21709) = 470868210 / 1
LCM(21690,21709) = 470868210

Least Common Multiple (LCM) of 21690 and 21709 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21690 and 21709. First we will calculate the prime factors of 21690 and 21709.

Prime Factorization of 21690

Prime Factorization of 21709

Now multiplying the highest exponent prime factors to calculate the LCM of 21690 and 21709.

LCM(21690,21709) = 2¹ × 3² × 5¹ × 241¹ × 17¹ × 1277¹
LCM(21690,21709) = 470868210