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    GCF of 20 and 40 (Greatest Common Factor)

    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    What is the Greatest Common Divisor of 20 and 40?

    Answer

    GCF of 20 and 40 is
    20

    (Twenty)

    Finding GCF for 20 and 40 using all factors (divisors) listing

    The first method to find GCF for numbers 20 and 40 is to list all factors for both numbers and pick the highest common one:

    All factors of 20: 1, 2, 4, 5, 10, 20

    All factors of 40: 1, 2, 4, 5, 8, 10, 20, 40

    So the Greatest Common Factor for 20 and 40 is 20

    Finding GCF for 20 and 40 by Prime Factorization

    The second method to find GCF for numbers 20 and 40 is to list all Prime Factors for both numbers and multiply the common ones:

    All Prime Factors of 20: 2, 2, 5

    All Prime Factors of 40: 2, 2, 2, 5

    As we can see there are Prime Factors common to both numbers: 2, 2, 5

    Now we need to multiply them to find GCF: 2 × 2 × 5 = 20

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    What is the GCF of 20 and 40. The GCF of 20 and 40 is 20 — the biggest number that can divide both integers. Step-by-step GCF (GCD) calculation by factoring.
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    GCF Table

    Number 1Number 2GCF
    20155
    20211
    20222
    20231
    20244
    20255
    20262
    20271
    20284
    203010
    20324
    20355
    20364
    20382
    20391
    204020
    20422
    20444
    20455
    20471
    20484
    205010
    20555
    20564
    20582
    20591
    206020
    2010020
    2014020
    2015010

    About "Greatest Common Factor" Calculator

    This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Divisor of 20 and 40? (The answer is: 20). Select the first number (e.g. '20') and the second number (e.g. '40'). After that hit the 'Calculate' button.
    Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder.
    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    FAQ

    What is the Greatest Common Divisor of 20 and 40?

    GCF of 20 and 40 is 20

    How to find the GCF of 20 and 40?

    You can find the GCF of 20 and 40 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 20 and 40 is 20.

    What prime factors do 20 and 40 share?

    The prime factorizations of 20 and 40 have 2 × 2 × 5 in common, and multiplying those shared primes gives 20 — exactly the greatest common factor.

    How does the GCF reduce the fraction 20/40?

    Divide the numerator and the denominator by the GCF 20: 20 ÷ 20 = 1 and 40 ÷ 20 = 2. So 20/40 in lowest terms is 1/2.

    See Also