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Wikipedia describes the thrusters:

Eighteen Draco thrusters are used on the Dragon spacecraft for attitude control and maneuvering. Dual-redundant in all axes: any two can fail and still have complete vehicle control in pitch, yaw, roll and translation.

Four Draco thrusters are used on the Falcon 9 second-stage as a reaction control system.

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I've looked at some pictures, and I think a thruster "pod" is a collection of 4 thrusters, all pointing in different directions. It looks like there are 4 such pods arranged around the edge of the Dragon capsule. That would account for 16 or the 18 thrusters.

Two of the pods have 5 thrusters. Those pods have two thrusters point "up". That give a total of six pointing "up". These are the thrusters used for the deorbit burn and having two extra is for redundancy

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