195530

I noticed that a number can’t be odd and even at the same time, so those had to go on the same side. There is only one even number that is prime and even, but I decided not to put them on the same side. I put triangular numbers, multiples of 3, multiples of 5, and square numbers on the same side but not with odd and even numbers since there are multiple even and odd numbers in all of those columns. I had spare prime numbers so I put them as the last heading on that side. The other side had odd numbers, even numbers, numbers less than 20, numbers more than 20, and factors of 60 because I got them to match up since there are lots of numbers that fit the categories on one side and less numbers that fit for each category on the other side.