18979280920 has 64 divisors (see below), whose sum is σ = 43562473920. Its totient is φ = 7439337984.

The previous prime is 18979280891. The next prime is 18979280959. The reversal of 18979280920 is 2908297981.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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, 1875394 + ... + 1885486.

It is an arithmetic number, because the mean of its divisors is an integer number (680663655).

Almost surely, 2^18979280920 is an apocalyptic number.

18979280920 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 18979280920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21781236960).

18979280920 is an abundant number, since it is smaller than the sum of its proper divisors (24583193000).

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

18979280920 is a wasteful number, since it uses less digits than its factorization.

18979280920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11044 (or 11040 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 55.

The spelling of 18979280920 in words is "eighteen billion, nine hundred seventy-nine million, two hundred eighty thousand, nine hundred twenty".