It has a maximum of 20 characters (and minimum of four (four!) characters) and is only case-insensitive alphanumeric. Also, it should be pronounceable since this is apparently used also as the password for their hotline services!
How do I proceed with this? Should I just whip out a random password generator and pronounce it letter-by-letter (or number-by-number) or should I make it vaguely pronounceable?
... but if the constraints are 4-20 alphanumeric characters case-insensitive pronounceable, then a sequence of words would work great.