48
The only number that's neither more nor less than 50 is 50.
The smallest odd number greater than 50 is 51.It doesn't matter what it's less than.
2n - 20 = 50
It is: 47
48
48 has 10 factors, the most factors of any number under 50.
42
16
1 has one factor.
1 is the number less than fifty with the fewest number of factors. All other numbers have at least two factors (1, and the integer itself).
The numbers for which the sum of its proper factors is 1 less than the number is the powers of 2; less than 50 these are: 2, 4, 8, 16 & 32.
There is no number that is greater than 50 AND less than 10 as 10 is less than 50! However, a number greater than 10 and less than 50 which fits the bill is 11 - it only has 2 factors 1 & 11 (it is prime) and has multiples 6x11 (=66) and 55x11 (=605). If the question was greater than 50 and less than 100 then the number could only be 66 as 66 is the only number greater than 50 which has 66 as a multiple, but 66 has 8 factors (1, 2, 3, 6, 11, 22, 33, 66), meaning there is no number in that range.
39
4, 9, 25 and 49
64.
30