17 is a Prime number and only has two factors, one and itself.
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8 only has four factors.
With the numbers: 0,1,2,3,4,5,6,7,8,9 there are 10000 four letter combination's - ten options for the first number times ten options for the second number times ten options for the third number and so on. :)
They are 1 and 17 because 17 is a prime number which has only two factors
all numbers can be broken down into its prime factors so if you want a number with 17 factors all you have to do is multiply the first 17 prime factors together 2*3*5*7*11*13*17*19*23*29*31*37*41*43*47*53*59=1922760350154212639070
17 is prime, its only factors are one and itself.