the number is 18
Twenty is composite. It has the factors 1, 2, 4 ,5, 10, and 20. Prime numbers have exactly two factors. Composite numbers have three or more.
The factors of 20 are: 1, 2, 4, 5, 10, 20
21 = 7 x 3 x 1.
The common factors are: 1, 2, 5, 10.
69
1 and 20, 2 and 10, 4 and 5 are all of the pairs of factors of 20.
The factors of six are one, two, three, and six. The factors of twenty six are one, two, thirteen, and twenty six. Two is the only factor of six that is also a factor of twenty six besides one. Therefore, two is the greatest common factor of six and twenty six.
Six factors.
1 and 7
Twenty only has three factor pairs. (20,1)(10,2)(5,4)
56 has six more factors than 23 does.