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All prime numbers have only two factors. 2, 3, 5, 7, 11
That could either be "What numbers have 5 factors" or "What numbers have 2 and 5 as factors." Prime numbers to the fourth power, like 16 and 81, have 5 factors. Any multiple of 10 has 2 and 5 as a factor.
(11+7+20+2+10)/5 = 50/5 = 10
140 = 2 * 2 * 5 * 7 700 = 2 * 2 * 5 * 5 * 7
The greatest common factor of 55 (5 x 11) and 105 (3 x 5 x 7) is 5.