While there are no official figures from Google, its new Nexus One phone has seen first week sales hit 20,000, estimates app analytics firm Flurry.

Flurry, which monitors usage of more than 10,000 developers' applications on iPhone and Android platforms, suggests that the Nexus One was outsold by Moto and Verizon's Droid by more than 12 times, the myTouch 3G by 3 times and iPhone 3GS by a whopping 80 times.

"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", explains the company.

Assuming the science is sound, Flurry's summary of the situation is that, despite the hype generated online for the new handset with leaks leading up to Christmas, "demand generation has been modest" and that the Nexus One has "fallen short on sales expectations".

However, Flurry points out that the Nexus One has had a relatively soft launch, as well as an unusual distribution method, while the Droid, for example, saw a marketing budget of $100 million.

While it seems from this report that the Nexus One's debut has not been stellar, only time will tell if the handset's sales will pick up to become the flagship Android device Google is hoping it will be.