Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Model | Years | Engine code | Power | Torque |
| --- | --- | --- | --- | --- |
| sDrive16d | 2012- | N47D20 | PS (kW; hp)@4000 | N·m (lb·ft)@1750-3000 |
| sDrive18d xDrive18d | 2009- | N47D20 | PS (kW; hp)@4000 | N·m (lb·ft)@1750-2500 |
| sDrive20d xDrive20d | 2009-2011 | N47D20 | PS (kW; hp)@4000 | N·m (lb·ft)@1750-3000 |
| xDrive20d | 2011- | N47D20 | PS (kW; hp)@4000 | N·m (lb·ft)@1750-2500 |
| sDrive20d EfficientDynamics Edition | 2011- | N47D20 | PS (kW; hp)@3250-4200 | N·m (lb·ft)@1750-2500 |
| xDrive23d | 2009- | N47D20 | PS (kW; hp)@4400 | N·m (lb·ft)@2000-2250 |
| xDrive25d | 2012- | N47D20 | PS (kW; hp)@4400 | N·m (lb·ft)@1500-2500 |
Question:
What is the engine code of the xdrive23d model?
Answer:
N47D20