215920 has 20 divisors (see below), whose sum is σ = 502200. Its totient is φ = 86336.

The previous prime is 215909. The next prime is 215921. The reversal of 215920 is 29512.

215920 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270 + ... + 1429.

It is an arithmetic number, because the mean of its divisors is an integer number (25110).

2²¹⁵⁹²⁰ is an apocalyptic number.

215920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215920 is an abundant number, since it is smaller than the sum of its proper divisors (286280).

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

215920 is a wasteful number, since it uses less digits than its factorization.

215920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712 (or 2706 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 215920 is about 464.6719272777. The cubic root of 215920 is about 59.9925916779.

The spelling of 215920 in words is "two hundred fifteen thousand, nine hundred twenty".