Declension table of ?samupagantavya

Neuter	Singular	Dual	Plural
Nominative	samupagantavyam	samupagantavye	samupagantavyāni
Vocative	samupagantavya	samupagantavye	samupagantavyāni
Accusative	samupagantavyam	samupagantavye	samupagantavyāni
Instrumental	samupagantavyena	samupagantavyābhyām	samupagantavyaiḥ
Dative	samupagantavyāya	samupagantavyābhyām	samupagantavyebhyaḥ
Ablative	samupagantavyāt	samupagantavyābhyām	samupagantavyebhyaḥ
Genitive	samupagantavyasya	samupagantavyayoḥ	samupagantavyānām
Locative	samupagantavye	samupagantavyayoḥ	samupagantavyeṣu

Compound samupagantavya -

Adverb -samupagantavyam -samupagantavyāt