正整数x 的约数是能整除x 的正整数。正整数x的约数个数记为div(x)。例如，1，2，5，10 都是正整数10的约数，且div(10)=4。设a 和b是2 个正整数，a≤b，找出a 和b之间约数个数最多的数x。对于给定的2 个正整数a≤b，计算a 和b之间约数个数最多的数。-About the number of the positive integer x is a positive integer divisible by x. The approximate number of positive integer x is denoted by div (x). For example, 1,2,5,10 are positive integers 10 approximately, and div (10) = 4. Let a and b are two positive integers, a ≤ b, find the a and b between the approximate number up to the number of x. 2 For a given positive integer a ≤ b, calculated between a and b Number number up to the number.