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What is the Least Common Multiple of 1802 and 1820?

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 (LCM) of 1802 and 1820 is 1639820.

LCM(1802,1820) = 1639820

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Least Common Multiple of 1802 and 1820 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1802 and 1820, than apply into the LCM equation.

GCF(1802,1820) = 2
LCM(1802,1820) = ( 1802 × 1820) / 2
LCM(1802,1820) = 3279640 / 2
LCM(1802,1820) = 1639820

Least Common Multiple (LCM) of 1802 and 1820 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1802 and 1820. First we will calculate the prime factors of 1802 and 1820.

Prime Factorization of 1802

Prime factors of 1802 are 2, 17, 53. Prime factorization of 1802 in exponential form is:

1802 = 21 × 171 × 531

Prime Factorization of 1820

Prime factors of 1820 are 2, 5, 7, 13. Prime factorization of 1820 in exponential form is:

1820 = 22 × 51 × 71 × 131

Now multiplying the highest exponent prime factors to calculate the LCM of 1802 and 1820.

LCM(1802,1820) = 22 × 171 × 531 × 51 × 71 × 131
LCM(1802,1820) = 1639820