Put larger tires on my road bike rims
Is 20mm really the inside width of your rim? Would be unusually wide for a road bike (I think currently around 17mm are most common). If it’s really 20mm inside width you can mount anything from 32 to 63mm wide tires on that rim. According to Schwalbe as narrow as 25mm would also be okay: https://www.schwalbe.com/files/schwalbe/userupload/Images/FAQ/reifen_felgen_2020/Reifen_Felgenkombinationen_2020_EN.pdf
Of course you need enough clearance in the fork, frame and (if you have them) rim brakes. Very wide (and therefore high) tires can also increase toe overlap on the front wheel (i.e. your toes hitting the front wheel in tight turns).