18210495920 has 80 divisors (see below), whose sum is σ = 43949651328. Its totient is φ = 7012254720.

The previous prime is 18210495911. The next prime is 18210495971. The reversal of 18210495920 is 2959401281.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189662 + ... + 269058.

Almost surely, 2^18210495920 is an apocalyptic number.

18210495920 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 18210495920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21974825664).

18210495920 is an abundant number, since it is smaller than the sum of its proper divisors (25739155408).

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

18210495920 is a wasteful number, since it uses less digits than its factorization.

18210495920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79518 (or 79512 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 18210495920 in words is "eighteen billion, two hundred ten million, four hundred ninety-five thousand, nine hundred twenty".