What is the Least Common Multiple of 21870 and 21882?

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 21870 and 21882 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21870 and 21882, than apply into the LCM equation.

GCF(21870,21882) = 6
LCM(21870,21882) = ( 21870 × 21882) / 6
LCM(21870,21882) = 478559340 / 6
LCM(21870,21882) = 79759890

Least Common Multiple (LCM) of 21870 and 21882 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21870 and 21882. First we will calculate the prime factors of 21870 and 21882.

Prime Factorization of 21870

Prime Factorization of 21882

Now multiplying the highest exponent prime factors to calculate the LCM of 21870 and 21882.

LCM(21870,21882) = 2¹ × 3⁷ × 5¹ × 7¹ × 521¹
LCM(21870,21882) = 79759890