Declension table of ?gacchetavya

Neuter	Singular	Dual	Plural
Nominative	gacchetavyam	gacchetavye	gacchetavyāni
Vocative	gacchetavya	gacchetavye	gacchetavyāni
Accusative	gacchetavyam	gacchetavye	gacchetavyāni
Instrumental	gacchetavyena	gacchetavyābhyām	gacchetavyaiḥ
Dative	gacchetavyāya	gacchetavyābhyām	gacchetavyebhyaḥ
Ablative	gacchetavyāt	gacchetavyābhyām	gacchetavyebhyaḥ
Genitive	gacchetavyasya	gacchetavyayoḥ	gacchetavyānām
Locative	gacchetavye	gacchetavyayoḥ	gacchetavyeṣu

Compound gacchetavya -

Adverb -gacchetavyam -gacchetavyāt