[DonRotolo]

You need 20 volts at 2 Amps, and your supply can deliver almost 20 volts (19 to be exact) at more than 2 Amps (2.4 to be exact).

So while your voltage (kind of like water pressure) is a little bit low, the current (think liters per minute) is sufficient. Extra amps are OK, since the device will use only as many Amps as it needs. The extra capacity of the supply just makes it work a little less hard (which is good).

I will not say it is OK to use this supply, but it probably won't cause any harm. What you have to ask is, what's the risk as compared to the reward?