For years between 2000 and 2010, it is common to say the whole number: 2000 = two thousand 2001 = two thousand one 2002 = two thousand two ... 2009 = two thousand nine Beyond the initial ten, we tend to say them in pairs: 2010 = twenty-ten 2011 = twenty-eleven 2012 = twenty-twelve 2020 = twenty-twenty Sometimes we even say some of the first ten in pairs (though never for 2000 and this is pretty colloquial): 2001 = twenty o one 2002 = twenty o two 2008 = twenty o eight 2009 = twenty o nine It is by no means wrong to say the full number and it is encouraged in a formal setting and in writing: 2010 = two thousand ten 2011 = two thousand eleven 2020 = two thousand twenty We also don't tend to say "year" unless needed: It's twenty-nineteen! I was born in nineteen ninety one. But you can: I was born in the year nineteen ninety one This year is twenty-nineteen! Note that you can't just add "year" in front of the number and expect it to be correct. As in the two preceding example sentences, you need to add either "the year" or "this year is" etc.

Two thousand and twenty/twenty twenty Both are correct, no difference