While we don’t have any solid numbers on Nexus One sales just yet, we can take an educated guess. And if we base that guess on Flurry, which monitors usage of over 10,000 developers’ applications on iPhone and Android platforms, the results are less than stellar.

According to Flurry, only about 20,000 Nexus Ones were sold in its first week on the market. It was outsold by Droid by more than 12 times, myTouch 3G by 3 times and iPhone 3GS by 80 times.

Here’s how the folks at Flurry came with this number:

“To estimate first week sales totals for the Nexus One, myTouch 3G, Droid and iPhone 3GS, Flurry detected new handsets within its system, and then made adjustments to account for varying levels of Flurry application penetration by handset. Flurry additionally crosschecked its estimates against Apple actual sales, released for iPhone 3GS, which totaled more than one million units over the three days, June 19 – 21, 2009. Flurry first week sales estimates can be found in the table below.”

Nexus One was a highly anticipated mobile phone, but Google didn’t spend millions of dollars advertising it, opting for a sort of a soft launch for the device. It’s also sold directly to the consumers through Google’s website, which may be an innovative approach, but it can also hurt sales. Motorola, on the other hand, had spent close to 100 million dollars advertising the Droid, and if Flurry’s numbers are correct, it definitely shows the difference a good advertising campaign can make.

[Image courtesy of Flurry]