23155540 has 24 divisors (see below), whose sum is σ = 48845160. Its totient is φ = 9220608.

The previous prime is 23155523. The next prime is 23155567. The reversal of 23155540 is 4555132.

It can be written as a sum of positive squares in 4 ways, for example, as 196 + 23155344 = 14^2 + 4812^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2176 + ... + 7144.

It is an arithmetic number, because the mean of its divisors is an integer number (2035215).

Almost surely, 2^23155540 is an apocalyptic number.

23155540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23155540 is an abundant number, since it is smaller than the sum of its proper divisors (25689620).

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

23155540 is a wasteful number, since it uses less digits than its factorization.

23155540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5211 (or 5209 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 23155540 is about 4812.0203657092. The cubic root of 23155540 is about 285.0263236176.

The spelling of 23155540 in words is "twenty-three million, one hundred fifty-five thousand, five hundred forty".