18620872 has 16 divisors (see below), whose sum is σ = 35506800. Its totient is φ = 9152400.

The previous prime is 18620843. The next prime is 18620873. The reversal of 18620872 is 27802681.

It is not an unprimeable number, because it can be changed into a prime (18620873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19254 + ... + 20197.

It is an arithmetic number, because the mean of its divisors is an integer number (2219175).

Almost surely, 2^18620872 is an apocalyptic number.

It is an amenable number.

18620872 is a deficient number, since it is larger than the sum of its proper divisors (16885928).

18620872 is a wasteful number, since it uses less digits than its factorization.

18620872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39516 (or 39512 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 18620872 is about 4315.1908416662. The cubic root of 18620872 is about 265.0533747953.

The spelling of 18620872 in words is "eighteen million, six hundred twenty thousand, eight hundred seventy-two".