18809295920 has 80 divisors (see below), whose sum is σ = 44449321728. Its totient is φ = 7400574720.

The previous prime is 18809295889. The next prime is 18809295929. The reversal of 18809295920 is 2959290881.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×18809295920² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18809295929) 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 15 ways as a sum of consecutive naturals, for example, 4344797 + ... + 4349123.

Almost surely, 2^18809295920 is an apocalyptic number.

18809295920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18809295920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22224660864).

18809295920 is an abundant number, since it is smaller than the sum of its proper divisors (25640025808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18809295920 is a wasteful number, since it uses less digits than its factorization.

18809295920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5218 (or 5212 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 53.

The spelling of 18809295920 in words is "eighteen billion, eight hundred nine million, two hundred ninety-five thousand, nine hundred twenty".