廾+1 = 4

廿ㄋㄧㄢˋniàn

ㄋㄧㄢˋniàn
  1. 二十。
    例「廿四史」、「行年已越廿載」。
英twenty (20)​, in a limited number of set expressions, also written using banker's character 念
德zwanzig
法vingt