LTC Difficulty

[mxride]

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