That Celestron 20mm erecting eyepiece is good for looking at the trees and tops of power poles a few blocks away, it is basically worthless for looking at the sky in my opinion.
I have been looking at Mars a lot lately using my huge Starsplitter 14.5" F4.5 dob, it is usually alright to look at Mars with my Meade 6.7mm UWA eyepiece, even using my big dob the planet is so small it is hard for me to see much of anything except that it is Mars, when I put that 2X removable barlow lens on to my 6.7mm eyepiece it turns that eyepiece into a 5mm eyepiece, when seeing is exceptionally good I can see detail on Mars, and I have to sit there for hours to see that detail as most the time it is blurry/dancing and it looks like a mini sun, but every once in a while it gets steady for a few seconds, this scope is a light gathering bucket and I rarely am able to use the equivalent of a 5mm eyepiece.
Now last night I used my Meade 14mm UWA eyepiece to look at something else because a cloud bank came in and Mars disappeared, I had heard that the Orion Nebula was in this certain area in the sky at a certain angle away from these 3 stars, I found it pretty quick, while Mars was a dancing this Nebula was crystal clear in my eyepiece, looking at planets is hard for me where I live, there are houses/businesses/roads for a mile in every direction from my house, this time of year we heat our houses which creates lots of turbulence if your trying to look over houses at planets, and it beats me how an image that has traveled 1344 light years can be clearer that the image of Mars that took 12 minutes to get to my telescope.