10 Passenger entry doors, 2 emergency passenger escape doors on the upper deck, 4 escape doors over the wings, 1 small escape door in the cockpit ceiling, 2 main cargo doors, 1 smaller bulk cargo door, 2 electrical compartment doors under the fuselage (1 of which provides access to the passenger compartment), and at least 7 other maintenance access doors in the wings, fuselage, and empennage (tail).
To answer, that's 22 external doors not counting maintenance accesses, 20 which can get you into the pax compartment (rear and bulk cargo compartments have no access).
This also doesn't count landing gear doors of which I believe there are 6) and internal doors as this will vary with the # of toilets and closets and crew rest comartments installed.
how many doors does a plane have
A Boeing 747 has four engines.
if you mean how many wheels is a Boeing 747, there are 18.
The Boeing 747 has at least 4 engines.
The Boeing 747 is manufactured by Boeing Commercial Airplanes.
The Maximum Take-Off Weight for a Boeing 747-100 is 333, 390kg; a Boeing 747-200 and 747-300 is 377,842kg; a Boeing 747-400 is 396,890kg; a Boeing 747-400ER is 412,775kg and the Boeing 747-8I is 442,253kg.
The most popular model, the Boeing 747-400 and the Boeing 747-8 can go at 988km/h
747
Qantas currently has 21 Boeing 747-400s and 6 Boeing 747-400ERs. Qantas is the only operator of the ER 747-400.
A Boeing 747 airliner holds 57,285 gallons of fuel
The Boeing 747 uses four engines.
Boeing created the Boeing 747.