XP Time.
I favour faster levelling up so you will require only 1/2 the normal XP to reach each level ie 10 000 to reach 21, 10,500 for 22 etc, spells and item creation similarly have their XP cost halved, from this point on. None of this retroactively applies to character creation.
Each PC living and dead with the exception of Janos gains 18600 XP from the combats. The possibly story award so far is 114600 XP of which you have earned 3581 XP each . Total gain 22181 XP. Since you can only gain 1 level at a time that is rounded down to 20,499 XP each.
Janos having an ECL of 21 has a slightly different amount 15080 XP from the combat and 3581 XP Story award for a total of 18661 XP.
Edit- Remember if you have Cohorts or animal companions you wish to level up you must give them the appropriate XP out of your share.