Yes, the Apple 11 can be charged with 20W fast.
However, the iPhone 11 does not come with a standard fast charge head and a fast charge cable, and is still a traditional USB-A lightning cable and 5W charging head. So if you want to charge the iPhone 11 fast, you need to buy a PD charging head and USB C to lightning cable.
support
Apple 11 official data shows that it supports 18W fast charging, the maximum battery charging output power can be 20W, Apple 11 maximum support 22w up and down fast charging,20w can be routine applications. The iPhone 11 supports a 20w charger for charging.
It can be used, because the Apple phone will automatically detect the charging current and voltage during the charging process, and will automatically identify.