The numbers from 13-19 are very similar to the English:
13 dreizehn
14 vierzehn
15 fünfzehn
But take note of:
16 sechzehn
17 siebzehn
sechzehn, not sechszehn; siebzehn, not siebenzehn.
The rest are as normal:
18 achtzehn
19 neunzehn
20 zwanzig
21 einundzwanzig
Note that, as in Old English, the singles digit is spoken before the tens digit.
22 zweiundzwanzig
23 dreiundzwanzig
24 vierundzwanzig
25 fünfundzwanzig
26 sechsundzwanzig
27 siebenundzwanzig
(26 and 27 use the entire words for 6 and 7)
28 achtundzwanzig
29 neunundzwanzig
And then the subsequent tens digits:
30 dreissig
40 vierzig
50 fünfzig
60 sechzig
70 siebzig
(using again a shortened version of 6 and 7)
80 achtzig
90 neunzig
It is important to remember that in German, all numbers are only one word in length, no matter how large the number
100 hundert
101 hunderteins
102 hundertzwei
114 hundertvierzehn
145 hundertfünfundvierzig
200 zweihundert
700 siebenhundert
1.000 tausend
4.837 viertausendachthundertsiebenunddreissig
Okay, not ALL words. For some reason, this is the exception:
1.000.000 eine Million
*Zwei is some times pronounced zwo in order to differentiate it from drei (which rhymes). This is mostly done when speaking over the phone or in other situations where some one needs to copy numbers down.