Does standing up immediately after the prayer, without the prescribed remembrances, invalidate the prayer, and is it permissible to perform the remembrances after standing up?

Reciting remembrances (adhkar) after prayer is a Sunnah. If someone deliberately omits these remembrances, their prayer is still valid. There is no harm for someone who stands up immediately after prayer, and this does not affect the validity of their prayer. It is preferable to perform these remembrances while seated in the mosque, as it is more conducive to humility of the heart and tranquility of the soul. If one performs them, or some of them, while on their way, they have still fulfilled the Sunnah. It is sunnah to remember Allah, supplicate, and seek forgiveness after the obligatory prayers, as mentioned in the narrations. The apparent meaning is that these should be said while seated. However, if they are said after standing up or while walking, there is no harm for the one who has observed the Sunnah. If one is distracted from them and then remembers them and recites them soon thereafter due to an excuse, it is apparent that the specific reward for them is obtained. However, if one deliberately abandons them and then remembers them after a long time, it is apparent that the specific reward for them is lost, though the general reward for remembrance (dhikr) remains.