Twenty Thousand
numeral
When you have two ten thousands, you have twenty thousand.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
二万ドル
twenty thousand dollars
二万マイル
twenty thousand miles
二万キロ
twenty thousand kilos
このマンゴーは二万円もしました。
This mango cost me 20,000 yen.
二万フォロワーおめでとうございます。
Congratulations on twenty thousand followers!
あのスニーカー、二万ドルもしたんだって！
Those sneakers cost 20,000 dollars, apparently!