English: Which synonyms for: a number of

Good morning.

I am reading a paper with several same syntax and I found it a bit weird. Could you please tell me which synonyms can be appropriate for those sentences ? a lot of, a bunch of, mainly, quite a few

What do you suggest ? and why ?

example:

- I discovered a number of artifacts

- I am reading a number of articles

- I took a large number of photographs (or pictures?)

- There are a number of paid and free options available

- It has a number of advantages over other, ...

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