18659209220 has 48 divisors (see below), whose sum is σ = 39790934400. Its totient is φ = 7348264704.

The previous prime is 18659209201. The next prime is 18659209237. The reversal of 18659209220 is 2290295681.

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, 4083377 + ... + 4087943.

It is an arithmetic number, because the mean of its divisors is an integer number (828977800).

Almost surely, 2^18659209220 is an apocalyptic number.

18659209220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18659209220 is an abundant number, since it is smaller than the sum of its proper divisors (21131725180).

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

18659209220 is a wasteful number, since it uses less digits than its factorization.

18659209220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7692 (or 7690 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 18659209220 in words is "eighteen billion, six hundred fifty-nine million, two hundred nine thousand, two hundred twenty".