Is 20 watts enough for an amp?

Could you please elaborate on why you're asking if 20 watts is sufficient for an amplifier? Are you concerned about the power output for a specific type of music or instrument? Is this for a home setup or a live performance? Understanding your needs and context will help me provide a more accurate answer. Also, keep in mind that the wattage rating is just one aspect to consider when choosing an amplifier, as other factors like impedance, frequency response, and tone shaping capabilities can play a significant role in its performance.