Efficient, low pressure ratio propeller for gas turbine engines

A gas turbine engine includes a spool (30), a turbine (46) coupled to drive the spool (30), and a propulsor (42) that is coupled to be driven by the turbine (46) through the spool (30). A gear assembly (48) is coupled between the propulsor (42) and the spool (30) such that rotation of the turbine (46) drives the propulsor (42) at a different speed than the spool (30). The propulsor (42) includes a hub (76) and a row (72) of propulsor blades (74) that extends from the hub (76). The row (72) includes no more than 20 of the propulsor blades (74).