The best replacement for 20 amp is 15 amp.

The best alternatives to 20 amp are rated as following:
★★★★★  15 amp
★★★★  30 amp
★★★  15 amp outlet
★★★  15 amp gfci
★★  15 amp breaker
★★  15 amp circuit
★  15 amp outlets
  50 amp
  15
  10 amp
  15 amp breakers

Your alternative for 20 amp is not listed? Suggest!
Speaking about 20 amp, one probably shouldn't forget about 14 wire.

Other search terms related to 20 amp and their ratings are:
★★★★★ 14 wire
★★ 15 amp
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20 amp
15 amp
30 amp