20023700189 has 4 divisors (see below), whose sum is σ = 21201564924. Its totient is φ = 18845835456.

The previous prime is 20023700149. The next prime is 20023700201. The reversal of 20023700189 is 98100732002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16677656164 + 3346044025 = 129142^2 + 57845^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023700189 - 2⁸ = 20023699933 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 (20023700149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588932342 + ... + 588932375.

It is an arithmetic number, because the mean of its divisors is an integer number (5300391231).

Almost surely, 2^20023700189 is an apocalyptic number.

It is an amenable number.

20023700189 is a deficient number, since it is larger than the sum of its proper divisors (1177864735).

20023700189 is a wasteful number, since it uses less digits than its factorization.

20023700189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177864734.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 20023700189 in words is "twenty billion, twenty-three million, seven hundred thousand, one hundred eighty-nine".