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You seem to have misunderstood; he didn't say number 20, but number 10. 😁
I agree with you, actually, the number 10 isn't Real Madrid's iconic jersey, but rather the number 7 worn by Vinicius Jr.
Even though I'm not a Real Madrid fan, I don't see anything particularly brilliant from Madrid, and he doesn't mind wearing any number. He hasn't won any titles for Real Madrid.
Except for Vinicius Jr., who has won several titles for the club and, in terms of skill, is more deserving of that number, just like Ronaldo in the past.
Although number 7 is not an iconic jersey at Real Madrid, it has always been worn by big names. So far only Luis Figo, Ozil and Luca Modric are the best among other players who have worn the number 10 jersey at Real Madrid. I was very surprised by the management's decision to give the number 10 to Mbappe, even though he has always been very synonymous with the number 9. Previously, there were also rumors that the number would belong to Arda Guler, but Real Madrid made a very surprising decision.
It is fitting that number 7 belongs to Vinicius since Ronaldo departure, previously the iconic number was also worn by Raul Gonzalez and Ronaldo, if you look at the list of players that Real Madrid had at that time, Vinicius was the one who met the criteria to wear the Jersey.