LTC Difficulty
Question, I started with the LTC config which looks like was created a few years ago.

Original sample settings
"listenAddress": "0.0.0.0",
"difficulty": 1024,
"name": "ASIC Mining",
"varDiff": {
"minDiff": 512,
"targetTime": 15,
"retargetTime": 90,
"variancePercent": 30

I changed my difficulty to this. I was looking to confirm I am correct or completely wrong. 
thanks in advance
NEW SETTINGS:

"listenAddress": "0.0.0.0",
          "difficulty": 20000000,
          "name": "ASIC Mining",
          "varDiff": {
            "minDiff": 500000,
            "targetTime": 15,
            "retargetTime": 90,
            "variancePercent": 30
