18269899920 has 400 divisors, whose sum is σ = 67247928000. Its totient is φ = 4584231936.

The previous prime is 18269899919. The next prime is 18269899927. The reversal of 18269899920 is 2999896281.

It is not an unprimeable number, because it can be changed into a prime (18269899927) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 22038066 + ... + 22038894.

It is an arithmetic number, because the mean of its divisors is an integer number (168119820).

Almost surely, 2^18269899920 is an apocalyptic number.

18269899920 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 18269899920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33623964000).

18269899920 is an abundant number, since it is smaller than the sum of its proper divisors (48978028080).

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

18269899920 is a wasteful number, since it uses less digits than its factorization.

18269899920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1037 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The spelling of 18269899920 in words is "eighteen billion, two hundred sixty-nine million, eight hundred ninety-nine thousand, nine hundred twenty".