23656240 has 20 divisors (see below), whose sum is σ = 55000944. Its totient is φ = 9462464.

The previous prime is 23656229. The next prime is 23656247. The reversal of 23656240 is 4265632.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 23656199 and 23656208.

It is not an unprimeable number, because it can be changed into a prime (23656247) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 147772 + ... + 147931.

Almost surely, 2^23656240 is an apocalyptic number.

23656240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23656240 is an abundant number, since it is smaller than the sum of its proper divisors (31344704).

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

23656240 is a wasteful number, since it uses less digits than its factorization.

23656240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295716 (or 295710 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 23656240 is about 4863.7680865765. The cubic root of 23656240 is about 287.0660978364.

The spelling of 23656240 in words is "twenty-three million, six hundred fifty-six thousand, two hundred forty".