zwanzig
twenty
The cardinal number 20; the number between nineteen and twenty-one.
Das Buch hat etwas mehr als zwanzig Euro gekostet.
The book cost a little more than twenty euros.

twenty
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twenty
The cardinal number 20; the number between nineteen and twenty-one.
Das Buch hat etwas mehr als zwanzig Euro gekostet.
The book cost a little more than twenty euros.

The numbers from 21 to 29 are formed according to the pattern 'ones and tens'. You say the ones digit first, then 'und' (and), then 'zwanzig' (twenty).
Meine Schwester ist dreiundzwanzig Jahre alt.
My sister is twenty-three years old.
The ending '-zig' is used for most tens numbers in German (vierzig, fünfzig, etc.). The first part 'zwan-' is historically related to the number 'zwei' (two).
Der Bus mit der Nummer vierzig fährt direkt zum Bahnhof.
The bus with the number forty goes directly to the train station.
To give an approximate age, the phrases 'Anfang zwanzig' (early twenties), 'Mitte zwanzig' (mid-twenties), or 'Ende zwanzig' (late twenties) are often used.
Die meisten Studenten in diesem Kurs sind Mitte zwanzig.
Most of the students in this course are in their mid-twenties.
two
'zwei' and 'zwanzig' are both numbers, but they mean very different quantities. 'zwei' means the number 2, while 'zwanzig' means the number 20. Learners may confuse them because both begin similarly with 'zwan-' or 'zw-' and can sound similar in fast conversations. The ending is important: 'zwei' is short, while 'zwanzig' is longer and has the ending '-zig'. With prices, times, or quantities, this difference makes a big difference.

Wegen des Wetters warten zwanzig Leute im Eingang.
Because of the weather, twenty people are waiting in the entrance.
Vor dem Termin habe ich noch zwei Fragen.
Before the appointment, I still have two questions.