How big of a buy is needed to break the 100k sell wall

I’m not entirely sure how the markets work but I was just kinda curious if someone bought 20million bitcoin right now on Coinbase for example ( I know no one would do that but instead OTC for that amount ) but would that fill out all the 100k sell orders in theory?

Just wondering if there’s a way to see how many sell orders there are at 100k and the amount in $.

Additionally, who’s placing sell orders over 100k really? Like if Bitcoin went past 100k what’s stopping it from becoming parabolic