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Tools / Prime factorization, GCD & LCM

Prime factorization, GCD & LCM

Enter one or more whole numbers separated by spaces or commas.

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Prime factors
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Trial division up to √n. GCD with the Euclidean algorithm; LCM = a × b ÷ GCD(a, b), applied pairwise.

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How to use it

  1. Enter one number for its prime factors.
  2. Enter several numbers for GCD and LCM.
  3. Read the results.
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Last checked: October 2026. Found a mistake? Use the form below – we fix confirmed errors and update the date.

Frequently asked questions

What is prime factorization?

Writing a number as a product of prime numbers: 360 = 2³ × 3² × 5.

What do I need the LCM for?

For example to find the common denominator when adding fractions.

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