How many Soviet republics were there?

Here, I found more or less normal statistics on the repressions and the Holodomor of 32-33.
So, about the Holodomor.
According to estimates by Ukrainian historian Pykhorovych, it is 640 thousand people. Now Ukraine loses 400 thousand people annually.
Even the most ardent anti-communists in Ukraine do not give figures higher than 3.5 million, though without providing a single piece of evidence. Where are the 6 million?
So, about the repressions.
According to the report of the Prosecutor General of the USSR Rudenko, the number of people convicted of counter-revolutionary crimes for the period from 1921 to February 1, 1954, by the OGPU Board, NKVD "troikas", Special Council, Military Board, courts and military tribunals was 3 777 380 people, including 642 980 sentenced to the highest measure of punishment.
According to data from historian Zemskov (not a communist): "In total, by 1940, there were 1 850 258 prisoners in camps, colonies and prisons... There were about 667 thousand death sentences over the entire period."
Where are the 16 million?
Mr. Liar-pants, as Korovyov used to say.