The number of confirmed COVID-19 cases across the globe topped 20 million Tuesday — more than half of them in the US, Brazil and India — and the number of deaths is over 737,000, according to figures from Johns Hopkins University.

It took about six months to reach 10 million cases after the deadly virus first appeared in the Chinese city of Wuhan late last year.

The US, India and Brazil combined accounted for nearly two-thirds of all reported infections since the world hit 15 million coronavirus cases on July 22, according to an analysis by the Associated Press of data through Sunday.

More than 163,000 people have died of the contagion in the US, where over 5 million have been infected, according to the latest figures.

Health officials believe the actual number of those infected is much higher than Johns Hopkins’ tally, given testing limitations, and that as many as 40 percent of those stricken with the bug show no symptoms.

On Tuesday, Russian President Vladimir Putin announced that his country has officially registered the world’s first COVID-19 vaccine — saying it offers “sustainable immunity” and that one of his daughters has already received shots.

Russia has reported more than 890,000 cases, the fourth-highest total in the world, according to Johns Hopkins.

“The point is not to be first with a vaccine,” US Health and Human Services Secretary Alex Azar said Tuesday during a visit to Taiwan when asked about the Russian vaccine.

In India, the number of new cases reported daily continues to surge, hitting a rolling seven-day average of 58,768.

On Tuesday, India reported 53,601 new cases as its count of total infections neared 2.3 million.

Its reported case mortality rate — at 2 percent — is much lower than in the US and Brazil.

Brazil has recorded more than 3 million cases and 100,000 deaths, according to CNN.