18920789 has 16 divisors (see below), whose sum is σ = 21513600. Its totient is φ = 16543296.

The previous prime is 18920773. The next prime is 18920807. The reversal of 18920789 is 98702981.

It is a cyclic number.

It is not a de Polignac number, because 18920789 - 2⁴ = 18920773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18920089) 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, 11927 + ... + 13419.

It is an arithmetic number, because the mean of its divisors is an integer number (1344600).

Almost surely, 2^18920789 is an apocalyptic number.

18920789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18920789 is a deficient number, since it is larger than the sum of its proper divisors (2592811).

18920789 is a wasteful number, since it uses less digits than its factorization.

18920789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 18920789 is about 4349.8033288874. The cubic root of 18920789 is about 266.4688294783.

The spelling of 18920789 in words is "eighteen million, nine hundred twenty thousand, seven hundred eighty-nine".