The best replacement for 20 is 40.

The best alternatives to 20 are rated as following:
★★★★★  40
★★★★★  12 gauge
★★★★  35 tint
★★★★  30
★★★★  30 developer
★★★  5w 30
★★★  30 volume developer
★★★  24 bmx
★★  22 bass drum
★★  12 gauge shotgun
★★  24 imac
★★  +
★  28 gauge
★  24 pin power supply
★  24 ar barrel
★  16 ar
★  15 window tint
★  glock 21
★  22
★  24 barrel
★  30 tint
★  40 bandwidth
★  24 inch ar barrel
★  24 pin atx
★  24 pin
★  35 window tint
★  29
★  40 age of love
★  phosphor bronze
★  canon 10 22
★  18 wheels
★  24 unicycle
  16 barrel
  20/40
  10w 30
  60
  15 tint
  16
  glock 29
  40 channel width
  22 monitor
  10 developer
  15 amp
  dss 25
  25 tint
  tokina 12 24
  5w 30 oil
  12 ga
  80
  glock 20sf
  5w 20
  beige 30
  prop 27
  30 window tint
  twenty
  mx 23
  18 tires
  pmi
  13 seer
  30 nitro
  24 pin power
  12 shotgun
  tween 80
  24
  oregon 450

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

Other search terms related to 20 and their ratings are:
★★★★★ wrinkles
★ intent
★ rob thomas
santana
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20
40
12 gauge