With ANY unit conversion problem all you need to do is multiply by 'One'.
BUT, and this is a big but,
the hard part is to find the Right One !!
And sometimes you need to multiply by 'One' more than once.
The first thing to do is to set up a blank problem with spaces to multiply by one.
-- Remember that anything divided by something that is equal to it is = one.
2,000,000 s X ( ??? ) If the two ??? things are equal then it is times one.
( ??? )
The problem is to find two things that are equal to put in place of the ??? marks.
We also need to have seconds in the denominator
to cancel out the seconds in the original value.
And we want to get days in the numerator so the final answer has units of days.
Do we know two things with units of days and seconds that are equal?
Well I don't know the number of seconds in a day - do you?
So, it looks like we will need to multiply by one more than once.
I do know there are 60 seconds in a minute so I can use these as my 1st 'One'.
2,000,000 s X ( 1 min ) X ( ??? ) 1 min = 60 seconds
( 60 s ) ( ??? ) ==>> SO 1 min ÷ 60 seconds = one
Notice I put in a place to multiply by a different 'One' to do a second step.
If you know how many minutes in a day we can do it in one more step.
But I don't. I do know that there are 60 minutes in an hour.
2,000,000 s X ( 1 min ) X ( 1 hr ) X ( ??? ) now the minutes will cancel out
( 60 s ) ( 60 min ) ( ??? ) and we have hours
Last step uses 1 day is 24 hours long.
2,000,000 s X ( 1 min ) X ( 1 hr ) X ( 1 da ) now we are left with days
( 60 s ) ( 60 min ) ( 24 hr )
I am sure you can do the arithmetic.
p.s. There is a song about this that made it to the Billboard Charts!
"Live like we're dying" https://genius.com/Kris-allen-live-like-were-dying-lyrics
There is also a poem about it. https://www.poemhunter.com/poem/86-400-seconds/
-- And If you are a theater geek you know how many minutes in a year - 525, 600.
From "Rent" the song "Seasons of Love".
And one last thing.
Notice the symbols I used for seconds, minutes, hours, and days.
The abbreviation for seconds is sec. When you write in English and use an abbreviation
the abbreviations have a period at the end of them. Street - St. Road - Rd. Second - Sec.
BUT the SYMBOL for the units of seconds is 's', not sec, and there is no period.
Minute is min , hour is hr , and day is da --- no periods.
AND there is no s at the end for plurals. --- 60 seconds is 60 s --- 24 hours is 24 hr
Okay, okay, I am picky!
But that is the correct way for units according to international standards.