86 + 279 = 365
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280
43 because it is 23 more than 20 and 23 less than 86.
86 is 330% more than 20 .
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.
279 is divisible by at-least 3 and 9 there may be more but those are just a couple