Well, that is far more fish than I would put in that tank.
Oriongirl is right, you need to consider adult size when deciding how to stock your tank. You should also decide whether you would be willing to deal with potentially substantial losses if the power goes out for a significant length of time. I.e. if the power goes out, your filter and heater will turn off - but more importantly, there will be virtually no surface disturbance, which is what dissolves the oxygen your fish breathe. You will also need to decide if you want to give the fish a decent chance at a healthy life, or if you just want to see more fish in your tank.
The number of fish means nothing without considering adult size. For example, my full-grown 12" pleco produces a lot more waste than a school of 8 1-1/2" cardinals, even though they are technically both 12 inches of fish.
Sometimes, stocking is more of an art than a science. You will hear people say one inch of fish per gallon of water, one inch of fish per 10-12 square inches of surface area, or some other formula. Those are good guidelines, but you can fool yourself into thinking you're not overstocked even though you go beyond these limits, if your fish survive because you have good filtration and the power doesn't go off for long. You may have a lot of fish in there that you can keep alive, but they will probably never be able to reach their adult size when they're crammed in so tight.
Max size x number of fish = Inches of fish. Find the adult sizes of your fish through books or internet searches (for the internet, find at least 2-3 sources that give the same info before using it) and stick them in that formula. This will give you an approximation you can fit into one or more of the scenarios above (using gallons or surface area as a guide).
IMO it is better to understock than overstock. You will see much more natural behavior from your fish, you don't have to worry so much about equipment failure, and your fish will be healthier. But it's your tank, and you can (and will) do whatever you choose with it.