All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
Some scholars interpreted the saying of Allaah (interpretation of meaning): {And Solomon inherited David}[27:16], that Prophet Daawood had 19 children, so Sulaimaan inherited the Prophecy and the kingdom. We are not aware of any other interpretation about the number of the children of Prophet Daawood .
Anyway, this question as the questioner already knows, does not necessitate any action, and there is not a great benefit from it.
Allaah knows best.