68
No 86 is not a prime number because it has more factors than 1 and itself, for example it has the factors 1, 2, 43, and itself: 86.
The GCF is 2
86 is a composite number: its factors are 1, 2, 43 and 86.
The LCM of 20, 68, and 86 is 14620.
68. Atomic mass of cyclopentanol is 86. Subtract 18 from 86, because water is lost in the Alcohol, and you arrive at the number 68.
100[(86 - 68)/68] = 26 %, to the justified number of significant digits, or in fraction form 18/68 = (9/34) % in lowest terms.
Any of its factors
2, 4, 17, 34, 43, 68, 86, 172, 731, 1462
The factors of 86 are 1, 2, 43, and 86.
The factors of 86 are: 1, 2, 43 and 86.
86 is composite because it has more factors besides 1 and itself.
The factors of 86 are 1,2,43 and 86. For them to be common factors, you need another set of factors to compare them to.