Breton, Cornish, and Manx, like French, are still all base 20. Recently (a few decades ago) the other Celtic languages: Welsh, Irish, and Scottish Gaelic, switched to base 10.
Fun fact: the unusual way of saying eighty in French ("four twenties") actually came about through the local contact with Celtic languages! I'm linguistic terms this is called "substratum influence"
Numbers in Danish are a bit odd.