advanced batch custom field editing

I have something like 400 posts witch all have a custom field named “price”
and in that custom field there is a different price for each post.

The thing is it was written in that format: 20 dollars,
and I need to change that to only contain the number without the word “dollars”.

Is there a way to do that for all those posts at once, without needing
to edit each one of those posts custom field?

Thank’s!