18995569920 has 432 divisors, whose sum is σ = 69476639232. Its totient is φ = 4784209920.

The previous prime is 18995569907. The next prime is 18995569921. The reversal of 18995569920 is 2996559981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18995569921) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 15355542 + ... + 15356778.

Almost surely, 2^18995569920 is an apocalyptic number.

18995569920 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 18995569920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34738319616).

18995569920 is an abundant number, since it is smaller than the sum of its proper divisors (50481069312).

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

18995569920 is a wasteful number, since it uses less digits than its factorization.

18995569920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338 (or 1321 counting only the distinct ones).

The product of its (nonzero) digits is 15746400, while the sum is 63.

The spelling of 18995569920 in words is "eighteen billion, nine hundred ninety-five million, five hundred sixty-nine thousand, nine hundred twenty".