No. Samsung Galaxy A20 does not have the IR sensor.
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.
Yes, Samsung Galaxy A20 does have the support for the FM radio.
No. Galaxy A20 does not have the NFC support.