What are the consequences of engaging in unrepented sinful acts that require Ghusl? Is it mandatory to make up missed prayers and fasts? What should I do if I cannot recall the exact number?
When Ghusl is obligatory for any reason including sinful acts, it remains obligatory till Ghusl is been performed. All Prayers and fasts which were performed with out Ghusl must be made up as Qadha.
If you are not sure about the exact numbers of days or prayers , you must take the number which is confirmed and make it up. Making more days up is a precaution.
Wassalam.