In the below Question, 5 numbers are given. Out of these 4 are alike in certain way but the rest 1 is different.

The number 23 is different because it's the only non-prime number in the list (23 = 3 + 2 + 3 = 8, but that's not the test - actually 23 IS prime). Wait, let me reconsider: 23 is divisible by 23 itself (which all are). The actual pattern is that 23 is the only number that is NOT divisible by 3 when summing its digits (2+3=5, not divisible by 3), whereas 13 (1+3=4), 17 (1+7=8), 37 (3+7=10), 73 (7+3=10) - this doesn't work either. The correct pattern: 23 is the only number whose digits don't multiply to give an odd number... no. Actually, the simplest pattern is 23 is the only number where the product of digits is not odd (2×3=6, even), while for others: 1×3=3 (odd), 1×7=7 (odd), 3×7=21 (odd), 7×3=21 (odd).