It is 19 which is a prime number
A number cannot be "less than but more than 40".
Answer -19
19
83 - 28 = 5555- 19 = 36.
There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.
19
1,3,5,7,9,11,13,15,17
29
19
-19?
It is 19 which is a prime number
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27
Because the sum of its proper divisors is less than 19.
A number cannot be "less than but more than 40".
19