15961920 has 112 divisors (see below), whose sum is σ = 54620160. Its totient is φ = 3926016.

The previous prime is 15961909. The next prime is 15961943. The reversal of 15961920 is 2916951.

15961920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11841 + ... + 13119.

It is an arithmetic number, because the mean of its divisors is an integer number (487680).

Almost surely, 2^15961920 is an apocalyptic number.

15961920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15961920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27310080).

15961920 is an abundant number, since it is smaller than the sum of its proper divisors (38658240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15961920 is a wasteful number, since it uses less digits than its factorization.

15961920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 15961920 is about 3995.2371644247. The cubic root of 15961920 is about 251.7841437024.

The spelling of 15961920 in words is "fifteen million, nine hundred sixty-one thousand, nine hundred twenty".