exam Maths Puzzle Numerical Ability

graph y^2-x^2=1

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(i) When x = 5, the integer x² -1=24 has 8 divisors: 1, 2, 3, 4, 6, 8, 12, and 24
Determine for which odd positive integer x between 2 and 20, the number x² -1 had the largest num
can someone please explain how to do this??!?! I dont care for the answers I just want to understand how to deal with this!
thanks in advance..
Determine S20 for the arithmetic s