What is the Least Common Multiple of 40620 and 40640?

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 40620 and 40640 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 40620 and 40640, than apply into the LCM equation.

GCF(40620,40640) = 20
LCM(40620,40640) = ( 40620 × 40640) / 20
LCM(40620,40640) = 1650796800 / 20
LCM(40620,40640) = 82539840

Least Common Multiple (LCM) of 40620 and 40640 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 40620 and 40640. First we will calculate the prime factors of 40620 and 40640.

Prime Factorization of 40620

Prime Factorization of 40640

Now multiplying the highest exponent prime factors to calculate the LCM of 40620 and 40640.

LCM(40620,40640) = 2⁶ × 3¹ × 5¹ × 677¹ × 127¹
LCM(40620,40640) = 82539840