◼ Don't enter anything and confirm to get a random number ◼ You can enter a number of up to 14 digits. (=10 trillions) (~25 to 60 seconds to calculate with that much digits) More digits than that takes too long to calculate. And Scratch no longer works with more than 16 digits anyway. ◼ "S. of div. w/out the dividend" means "Summation of divisors without the dividend"
If you like this project, you're probably gonna like this one https://scratch.mit.edu/projects/374868903/ (Simplest and Fastest prime number generator ever, 23 blocks of code)