Your question is somewhat incomplete, but based on the number (zwanzigtausend is German for 20,000) what you have is probably a 20,000 mark note from the 1920s. It was issued during a period of hyperinflation so its actual purchasing power was very low.
Most German banknotes from that time aren't worth a tremendous amount because so many were printed as the government tried to keep up with changing prices. For example, if your bill has the date February 20, 1923 (probably written "20.2.1923" or "2 Februar 1923" in German) it's only worth a euro - about $1.45.
The value of a paper 1915 20 Zwanzig Mark banknote varies depending on its condition and rarity. Typically, these banknotes can range in value from $5 to $50 USD. For an accurate valuation, it's recommended to consult a currency collector or a professional appraiser.
The schilling was used by Austria until they switched to the Euro in 2002. 20 schillings would have been worth about $1.40 US.
In 1948 all previous forms of the Deutsche Mark including the Zwanzig Deutsche mark merged into one common conversion rate. In 2002 the Deutsche Mark was considered null and void of value and was replaced by the euro.
20 is zwanzig
"Zwanzig Mark Alliierte Militarbehorde" is German for "20 Mark Allied Military Authorities." These notes were printed by the Allied Authority in Germany after the end of the Second World War, and the date on the note is likely 1944. These notes are not particularly rare, so it is likely worth less than $5US.
Twenty in German is zwanzig (pronounced: tzvahn-tzik).The numbers remain the same.
zwanzig
Zwanzig
20 = zwanzig
It is the German word for twenty (20).
In what? What currency are you trying to convert to? A mark was the currency of Germany until the introduction of the euro. "zwanzig millionen" is twenty million.
Sie sind zwanzig