19818990023 has 8 divisors (see below), whose sum is σ = 23262444192. Its totient is φ = 16528578336.

The previous prime is 19818989999. The next prime is 19818990043. The reversal of 19818990023 is 32009981891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19818990023 - 2⁸ = 19818989767 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 (19818990043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38260340 + ... + 38260857.

It is an arithmetic number, because the mean of its divisors is an integer number (2907805524).

Almost surely, 2^19818990023 is an apocalyptic number.

19818990023 is a deficient number, since it is larger than the sum of its proper divisors (3443454169).

19818990023 is an equidigital number, since it uses as much as digits as its factorization.

19818990023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76521241.

The product of its (nonzero) digits is 279936, while the sum is 50.

The spelling of 19818990023 in words is "nineteen billion, eight hundred eighteen million, nine hundred ninety thousand, twenty-three".