23321840 has 40 divisors (see below), whose sum is σ = 55695840. Its totient is φ = 9075456.

The previous prime is 23321833. The next prime is 23321939. The reversal of 23321840 is 4812332.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 980 + ... + 6899.

It is an arithmetic number, because the mean of its divisors is an integer number (1392396).

Almost surely, 2^23321840 is an apocalyptic number.

23321840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23321840 is an abundant number, since it is smaller than the sum of its proper divisors (32374000).

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

23321840 is a wasteful number, since it uses less digits than its factorization.

23321840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7929 (or 7923 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 23321840 is about 4829.2690958363. The cubic root of 23321840 is about 285.7070369590.

The spelling of 23321840 in words is "twenty-three million, three hundred twenty-one thousand, eight hundred forty".