18020959 has 4 divisors (see below), whose sum is σ = 19659240. Its totient is φ = 16382680.

The previous prime is 18020957. The next prime is 18020963. The reversal of 18020959 is 95902081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18020959 - 2¹ = 18020957 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 (18020957) 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, 819124 + ... + 819145.

It is an arithmetic number, because the mean of its divisors is an integer number (4914810).

Almost surely, 2^18020959 is an apocalyptic number.

18020959 is a deficient number, since it is larger than the sum of its proper divisors (1638281).

18020959 is a wasteful number, since it uses less digits than its factorization.

18020959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638280.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 18020959 is about 4245.1100103531. The cubic root of 18020959 is about 262.1758187050.

The spelling of 18020959 in words is "eighteen million, twenty thousand, nine hundred fifty-nine".