Generator Cord Question

I'm purchasing a Westinhouse 28000 Watt portable generator for my home. Our home has an attached dwelling unit and calculated about 23000 watts is dedicated to the panel thats connected to our generator power inlet. The power inlet box is 50amp, 125/150 V . The 50amp power cords I've found also show a wattage rating of 12500. Does the power cord wattage rating need to match the generator size?