The winner of the 20th Ballon d'Or was Lionel Messi. He won the award in 2015, which was the 20th instance of the Ballon d'Or given annually since its inception in 1956. Messi has won the award multiple times and is one of the most celebrated players in its history.
If the question meant the 20th winner specifically counting up to the 20th award, that would align with Messi in 2015. If it refers to the 2020 Ballon d'Or, it was not awarded due to the COVID-19 pandemic.
