20 Points is a great hand, but always open at the 2 level?

My view with a singleton (honour or not) is that 2NT or a 2NT rebid is not the correct bid.

Open at the 1 level - if partner has nothing, 1 of a suit is likely to be the correct contract (amazing, but 20 points between you is not enough for much more on most hands).

In this hand, partner has the danger suit.  If they bid it (as I would), problem solved.  If not, they could say 1NT - in this case, you still know the D suit is covered, don't you?

What does 1NT show over partners minor?  It shows no 4 card major, this means only 6 cards can be in the majors and therefore 7 cards are in the minors.  Extend this logic, they have 2 card support for you and so have 5♦, or 3 card support and 4♦.  If they opted to bid 1NT with 4 or 5 in your suit, they will now pass with an ever spread of points or they will take it out into game in your suit.  Think about this and make sure you understand the logic, I think this level of understanding of partners shape is vital in bidding.