23720866 has 16 divisors (see below), whose sum is σ = 39985344. Its totient is φ = 10471824.

The previous prime is 23720861. The next prime is 23720909. The reversal of 23720866 is 66802732.

It is not an unprimeable number, because it can be changed into a prime (23720861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19236 + ... + 20431.

It is an arithmetic number, because the mean of its divisors is an integer number (2499084).

Almost surely, 2^23720866 is an apocalyptic number.

23720866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

23720866 is a deficient number, since it is larger than the sum of its proper divisors (16264478).

23720866 is a wasteful number, since it uses less digits than its factorization.

23720866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39705.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 23720866 is about 4870.4071698370. The cubic root of 23720866 is about 287.3272701578.

The spelling of 23720866 in words is "twenty-three million, seven hundred twenty thousand, eight hundred sixty-six".