20388742183 has 4 divisors (see below), whose sum is σ = 20393130568. Its totient is φ = 20384353800.

The previous prime is 20388742177. The next prime is 20388742207. The reversal of 20388742183 is 38124788302.

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 20388742183 - 2²¹ = 20386645031 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 (20388742483) 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, 2187216 + ... + 2196517.

It is an arithmetic number, because the mean of its divisors is an integer number (5098282642).

Almost surely, 2^20388742183 is an apocalyptic number.

20388742183 is a deficient number, since it is larger than the sum of its proper divisors (4388385).

20388742183 is an equidigital number, since it uses as much as digits as its factorization.

20388742183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388384.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 20388742183 in words is "twenty billion, three hundred eighty-eight million, seven hundred forty-two thousand, one hundred eighty-three".