A spaceship orbits around a planet at a height of $20 km$ from its surface. Assuming that only gravitational field of the planet acts on the spaceship, what will be the number of complete revolutions made by the spaceship in $24 hours$ around the planet? 

[Given: Mass of planet= $8 \times {10}^{22} kg,$

Radius of planet $=2 \times {10}^6 \mathrm{m},$

Gravitational constant $G=6.67 \times {10}^{-11} \mathrm{N} {\mathrm{m}}^2/{\mathrm{kg}}^2]$