The predecessor of 20000 exceeds largest 4 digit number by

Q. The predecessor of the largest 4 digit number is .

Q. All the five digits number in which each successive digit exceeds its predecessor are arranged in the increasing order of their magnitude the ${97}^{th}$number does not contain the digit.

Q. A two-digit number is such that it exceeds the sum of the number formed by reversing the digits and sum of the digits by $4$. Also the original number exceeds the reversed number by $18$. Find the product of the digits.