No. Samsung Galaxy A20 does not have the Corning Gorilla glass protection. However, the mobile does have a scratch resistant display.
No. Galaxy A20 does not have the NFC support.
Yes, Samsung Galaxy A20 does have the face unlock support.
Yes, Samsung Galaxy A20 does have fast charging support. It has USB Type-C charging port and the mobile comes with a 15W fast charger in the box.
No. Samsung Galaxy A20 comes with 2 dedicated 4G sim card slots and a dedicated MicroSD card slot. So, basically, you can use 2 sim cards and a memory card at the same time.