20188023 has 4 divisors (see below), whose sum is σ = 26917368. Its totient is φ = 13458680.

The previous prime is 20188019. The next prime is 20188033. The reversal of 20188023 is 32088102.

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 20188023 - 2² = 20188019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20187984 and 20188002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20188033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3364668 + ... + 3364673.

It is an arithmetic number, because the mean of its divisors is an integer number (6729342).

Almost surely, 2^20188023 is an apocalyptic number.

20188023 is a deficient number, since it is larger than the sum of its proper divisors (6729345).

20188023 is an equidigital number, since it uses as much as digits as its factorization.

20188023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6729344.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20188023 is about 4493.1083895228. The cubic root of 20188023 is about 272.2897314605.

The spelling of 20188023 in words is "twenty million, one hundred eighty-eight thousand, twenty-three".