20718423183 has 4 divisors (see below), whose sum is σ = 27624564248. Its totient is φ = 13812282120.

The previous prime is 20718423163. The next prime is 20718423191. The reversal of 20718423183 is 38132481702.

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

It is not a de Polignac number, because 20718423183 - 2⁹ = 20718422671 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 (20718423163) 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, 3453070528 + ... + 3453070533.

It is an arithmetic number, because the mean of its divisors is an integer number (6906141062).

Almost surely, 2^20718423183 is an apocalyptic number.

20718423183 is a deficient number, since it is larger than the sum of its proper divisors (6906141065).

20718423183 is an equidigital number, since it uses as much as digits as its factorization.

20718423183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6906141064.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 20718423183 in words is "twenty billion, seven hundred eighteen million, four hundred twenty-three thousand, one hundred eighty-three".