SB 10.50.4

akṣauhiṇībhir viṁśatyā
tisṛbhiś cāpi saṁvṛtaḥ
yadu-rājadhānīṁ mathurāṁ
nyarudhat sarvato diśam

akṣauhiṇībhiḥ—by akṣauhiṇī divisions (each consisting of 21,870 soldiers on elephants, 21,870 charioteers, 65,610 cavalrymen and 109,350 infantry soldiers); viṁśatyā—twenty; tisṛbhiḥ ca api—plus three; saṁvṛtaḥ—surrounded; yadu—of the dynasty of Yadu; rājadhānīm—the royal capital; mathurām—Mathurā; nyarudhat—he besieged; sarvataḥ diśam-on all sides.

With a force of twenty-three akṣauhiṇī divisions, he laid siege to the Yadu capital, Mathurā, on all sides.

The numbers involved in an akṣauhiṇī division are given in the word meanings. An akṣauhiṇī was a standard fighting force in ancient times.