Crown

620 (the number of letters in the 10 Commandments) is the numerical value of the word 'crown' in Hebrew. 

As such we find that the Jewish people – who carry the responsibility for the 613 commandments – together with the righteous gentiles who are responsible for the universal commandments, together adorn the Almighty's crown of Kingship over the entire world the the 620 jewels – the commandments of the Almighty's words unto man.

- from Kabbalah and Meditation for the Nations, Rabbi Yitzchak Ginsburgh

Beginning with Adam

Though the 10 Commandments are made up of 10 separate articles, they include more than 10 of the torah's 613 commandments. 

Indeed, even the earliest commentators on the Torah write that the text of the Ten Commandments alludes to all 613 commandments.

The most important allusion to this is that the orignal Hebrew text of the Ten Commandments (as they appear in exodus 20:2 tru 20:13) contains exactly 620 letters. 620 is 7 more than 613.

According to some Rabbinic authorities, the 7 commandments that complement the 613 commandments given to the Jewish people are the 7 Laws of Bnei Noach, that were given to the first generations of man, beginning with Adam.

- from Kabbalah and Meditation for the Nations, Rabbi Yitzchak Ginsburgh