18204065620 has 24 divisors (see below), whose sum is σ = 41169195144. Its totient is φ = 6721501056.

The previous prime is 18204065569. The next prime is 18204065651. The reversal of 18204065620 is 2656040281.

It can be written as a sum of positive squares in 4 ways, for example, as 2424183696 + 15779881924 = 49236^2 + 125618^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35007559 + ... + 35008078.

It is an arithmetic number, because the mean of its divisors is an integer number (1715383131).

Almost surely, 2^18204065620 is an apocalyptic number.

18204065620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18204065620 is an abundant number, since it is smaller than the sum of its proper divisors (22965129524).

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

18204065620 is a wasteful number, since it uses less digits than its factorization.

18204065620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70015659 (or 70015657 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 18204065620 in words is "eighteen billion, two hundred four million, sixty-five thousand, six hundred twenty".