Generate Random 20 Digit-Integer Key [closed]

I tried to use crunch for this case but I just can get numbers like: 000000000000000041242 What I need is a number like: 56248343627437350491 I mean full numbers without thousands of zeros and I just mean thousands of zeros in front of the numbers. Does someone has an idea? I googled very much but wasn’t able to find a good solution.