18920913 has 16 divisors (see below), whose sum is σ = 27648000. Its totient is φ = 11414480.

The previous prime is 18920899. The next prime is 18920921. The reversal of 18920913 is 31902981.

It is not a de Polignac number, because 18920913 - 2⁴ = 18920897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18920413) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6688 + ... + 9086.

It is an arithmetic number, because the mean of its divisors is an integer number (1728000).

Almost surely, 2^18920913 is an apocalyptic number.

It is an amenable number.

18920913 is a deficient number, since it is larger than the sum of its proper divisors (8727087).

18920913 is a wasteful number, since it uses less digits than its factorization.

18920913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 18920913 is about 4349.8175823820. The cubic root of 18920913 is about 266.4694115904.

The spelling of 18920913 in words is "eighteen million, nine hundred twenty thousand, nine hundred thirteen".