AlfatogodeQFBere:

Close to Korean... Interesting!

Yess some number's pronounciation are similar to Korean

13. สิบสาม (sib sam)

13 two times ?

14. चतुर्दश (chaturdasha

DASHA means 10 +4

 Lilly:

13 two times ?

14. चतुर्दश (chaturdasha

Sorry, I was slept.

16 - Dieciseis.

17. १७ सप्तदश saptadaśa.

19.  नवदश (navadasha)

21. एकविंशतिः. ekaviṃśatiḥ

23. त्रयोविंशतिः. trayoviṃśatiḥ.

24. ยี่สิบสี่ (yi-sib-si)

25. Twenty five पञ्चविंशतिः (panchavimshatihi)

Vimshatihi means twenty +5