* Convert to the same units: You can either convert inches to centimeters or centimeters to inches.

* Conversion: There are approximately 2.54 centimeters in one inch.

Method 1: Convert inches to centimeters:

* 20 inches * 2.54 cm/inch = 50.8 cm

Method 2: Convert centimeters to inches:

* 50 cm / 2.54 cm/inch = 19.69 inches

Conclusion:

* 20 inches is slightly greater than 50 cm.