Wow those are some high numbers. You'd better show us how the plants look first.
I suspect this isn't the right time to apply such a fertilizer though, unless extreme case and in need. Chemical/salt based high nutrient fertilizer in the soil will make it more difficult for the plant to absorb water by osmosis. As already mentioned, uneven watering and difficulty moving calcium while the fruit is setting and developing is the primary cause of BER.
Take a look at the multi-page Blossom End Rot sticky thread at the top of the tomato growing forum for details and remedies. Subject: BER -- Blossom End Rot
If you do need to fertilize now, with the tomato plants blooming and setting fruits, the nutrient ratio should be higher in the P and K but lower in the N (first number). If you've already been fertilizing with the 20-20-20, I suspect you wouldn't need any more at this point,