The device will not be able to load the Android SDK correctly.
You can confirm this by checking the sum of the md5 file:
wget -O - http://dl.google.com/android/android-sdk_r20-linux.tgz | md5sum
This should output: 22a81cf1d4a951c62f71a8758290e9bb
If this is not the case, I assume that you are blocked by some kind of proxy server or firewall. A proxy server can be configured to limit the maximum file size that you are trying to download. Check the logs or contact your system administrators if you are not a machine administrator.
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