18890020263 has 8 divisors (see below), whose sum is σ = 25277621488. Its totient is φ = 12547882944.

The previous prime is 18890020231. The next prime is 18890020297. The reversal of 18890020263 is 36202009881.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18890020263 - 2⁵ = 18890020231 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 (18890020063) 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, 11365006 + ... + 11366667.

It is an arithmetic number, because the mean of its divisors is an integer number (3159702686).

Almost surely, 2^18890020263 is an apocalyptic number.

18890020263 is a deficient number, since it is larger than the sum of its proper divisors (6387601225).

18890020263 is a wasteful number, since it uses less digits than its factorization.

18890020263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22731953.

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 18890020263 in words is "eighteen billion, eight hundred ninety million, twenty thousand, two hundred sixty-three".