Okies, done some kanji manipulation. To summarise in one sentence, at level 20, you’ve learnt 95% of the kanji in the link I posted above, or to put it another way, all of them save fifteen. The last fifteen are:
査 (21)
案 (22)
供 (24)
質 (24)
違 (24)
授 (26)
貸 (27)
痛 (27)
怒 (27)
絶 (28)
婚 (30)
彼 (35)
払 (35)
遅 (35)
歳 (46)
Here’s the full list: