In all of baseball history (well, at least in the baseball-reference.com era, since 1904) there have been just 12 shutouts where the winning team scored 19 or more runs.
You read about one of those in the “worst losses” series here the other day, the 22-0 whitewashing of the 1975 Cubs by the Pirates.
In this article you’ll read about a blowout shutout where the Cubs came out on top. Keep in mind that the Cubs weren’t always called “Cubs” in those days. That didn’t become more or less official until a couple of years later.