What is the Least Common Multiple of 21020 and 21040?

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 21020 and 21040 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21020 and 21040, than apply into the LCM equation.

GCF(21020,21040) = 20
LCM(21020,21040) = ( 21020 × 21040) / 20
LCM(21020,21040) = 442260800 / 20
LCM(21020,21040) = 22113040

Least Common Multiple (LCM) of 21020 and 21040 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21020 and 21040. First we will calculate the prime factors of 21020 and 21040.

Prime Factorization of 21020

Prime Factorization of 21040

Now multiplying the highest exponent prime factors to calculate the LCM of 21020 and 21040.

LCM(21020,21040) = 2⁴ × 5¹ × 1051¹ × 263¹
LCM(21020,21040) = 22113040