See this website for the pure population numbers, Countries in the world by population (2020).
But, also look at the median age and the fertility rate. You can see that Japan and Germany have an aging population. Who will take care of all those old people? Note, Japan has no inbound migration.
I also think that India may well be the country with the most coronavirus deaths, just based on population and not as mature a medical capability as China.
Diane Newman shared the link above.