expression, adverb, noun which may take the genitive case particle 'no'
in great numbers; many; numerous
Used adverbially or before の to say that people or things exist, appear, are made, are reported, etc. in large numbers. It emphasizes countable abundance rather than amount in general.
その会議には海外からも数多くの研究者が参加した。
Many researchers from overseas also attended the conference.
この地域では古い寺が数多く残っている。
Many old temples remain in this area.
A noun or no-adjective meaning 'a large number' or 'majority'; 数多く functions naturally as an adverb as well as before の.
Transparent compound of 数, 'number', and 多く, the adverbial form of 多い, 'many'; literally, 'many in number.'