23278520 has 32 divisors (see below), whose sum is σ = 54069120. Its totient is φ = 9010560.

The previous prime is 23278517. The next prime is 23278531. The reversal of 23278520 is 2587232.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8147 + ... + 10626.

It is an arithmetic number, because the mean of its divisors is an integer number (1689660).

Almost surely, 2^23278520 is an apocalyptic number.

23278520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23278520 is an abundant number, since it is smaller than the sum of its proper divisors (30790600).

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

23278520 is a wasteful number, since it uses less digits than its factorization.

23278520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18815 (or 18811 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 23278520 is about 4824.7818603539. The cubic root of 23278520 is about 285.5300283407.

The spelling of 23278520 in words is "twenty-three million, two hundred seventy-eight thousand, five hundred twenty".