Eight numbers are factors of 40, including 1, 2 and 4. Other factors of 40 are 5, 8, 10, 20 and 40.
Know MoreThe factors of a number are those that divide evenly into the number in question. To factor a number, it is expressed as a product of smaller numbers which is referred to as factorization. For example, factoring the number 12 would result in 3 x 4, but it can be further factored as 12 = 2 x 2 x 3. If a number can not be factored any further, it is known as a prime number. The greatest common factor is the greatest number that two numbers have in common. For instance, the greatest common factor of 16 and 12 is 4 because it is the largest number that can be evenly divided into both numbers.
Learn more about NumbersThe factors of 15 are three and five. The factors of 15 are the numbers that 15 can be divided by to give a whole number. Because every number is divisible by itself and one, the numbers one and 15 are not usually defined as being factors of 15.
Full Answer >The number 57 has four factors. These are 1, 3, 19 and 57. Factors of a number are numbers that can be multiplied to equal the given number.
Full Answer >The factors of the number 91 are 1, 7, 13 and 91. The factors of a number are obtained by dividing that number by other numbers. If a number is less than or equal to 91 and divides 91 exactly without leaving a remainder, it is a factor of 91.
Full Answer >The factors of 4 are 4, 1 and 2. The product of two or more factors of a number is equal to that number. Four, 1 and 2 are factors because 1 x 4 = 4, 4 x 1 = 4 and 2 x 2 = 4.
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