Who called from 2020693572

Came up as Name Unavailable.  No message.  Could be a political call?

Called twice within a few minutes.  No message.

Called twice in three hours

Some woman with a deep voice.  Claimed to be from a research center.  I hung up on her/him!!

I did not answer because it looked like a fake number. After it stopped ringing, I called the number adding "1" in front.
'your call cannot be completed as dialed' recording came on. Called again without the "1" - same result.