+1 = 4 

廿ㄋㄧㄢˋniàn

  1. ·李斯泰山刻石〉:皇帝明法廿。」·杜甫客堂廿得無。」

廿
twenty (20)​, in a limited number of set expressions, also written using banker's character 念
vingt
zwanzig