At 20 satoshi/byte, I would have expected blockchain.info to show it though.
At this low fee, it's very unlikely to confirm. It's best to abandon the transaction and try again with a higher fee.
Also blockchain.info is showing all transaction even with extremely low fees.
My advice is to abandon transaction and move to better wallet, my friend got same problem with another wallet. Electrum if fine...
it seems lately bc.info mempool's minimum fee has been raised to somewhat high rate
a couple days ago I failed pushing a tx with 50s/B, bc.info rejected with message
Validation Error: Insufficient fee. Please try again with a higher fee.
@koston just follow LoyceV instructions to abandon your transaction
then you can resend again with higher fee, not too high, but sufficient for it to get included in the next few blocks
if you don't want to wait, you can import to another wallet and create a new "double spend attempt" transaction