一至20的英语,第一到第20的英语怎么拼?

一至20的英语,第一到第20的英语怎么拼?
今天突然有一小孩问我,20的英语怎么拼,还有第一到第20的英语怎么拼~我当时就楞了,我忘了好久了耶~

one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty
first second third fourth fifth sixth seventh eighth nineth tenth eleventh twelfth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth twentieth