Indicates position 20 in a sequence. As an ordinal number, it is always used with an adjectival ending (e.g. zwanzigste, zwanzigster, zwanzigstes).
example
Sie feiert heute ihren zwanzigsten Geburtstag.
She is celebrating her twentieth birthday today.
Usage tips
Forming the ordinal number
Ordinal numbers from 20 onward are formed by adding the ending '-ste' to the cardinal number. This rule applies to all numbers up to 99, for example: einundzwanzigste (twenty-first), dreißigste (thirtieth), vierzigste (fortieth).
EXAMPLE
Wir wohnen im einundzwanzigsten Stock.
We live on the twenty-first floor.
Use with dates
With dates, the ordinal number is used with 'am' and always takes the ending '-sten'. This applies to all ordinal numbers.
EXAMPLE
Mein Geburtstag ist am zwanzigsten März.
My birthday is on the twentieth of March.
Declension like adjectives
The word 'zwanzigst-' behaves like a normal adjective. It comes before a noun, and its ending (-e, -er, -es, -en) changes depending on the article, gender, and case of the noun.
EXAMPLE
Das ist schon der zwanzigste Anruf heute.
That is already the twentieth call today.
Compare with
confusable
zwanzigst vs zwanzig
twenty
'zwanzig' and 'zwanzigst-' look similar, but they are used differently. 'zwanzig' is the number 20 and says how many things or people there are. 'zwanzigst-' describes a position in an order, meaning place number 20. It always needs an ending, for example 'der zwanzigste Tag' (the twentieth day) or 'die zwanzigste Seite' (the twentieth page). Learners often confuse the words because both belong to the number 20. Memory tip: 'zwanzig' counts a quantity; 'zwanzigste' places something in a sequence.
zwanzigst
Emma liest im Bus die zwanzigste Seite ihres neuen Buches.
Emma reads the twentieth page of her new book on the bus.
zwanzig
Die Eltern haben nach dem Essen zwanzig Euro für den Parkplatz bezahlt.
After the meal, the parents paid twenty euros for parking.