20081535888 has 80 divisors (see below), whose sum is σ = 54669108096. Its totient is φ = 6339379200.

The previous prime is 20081535863. The next prime is 20081535893. The reversal of 20081535888 is 88853518002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21456 + ... + 201552.

Almost surely, 2^20081535888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20081535888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27334554048).

20081535888 is an abundant number, since it is smaller than the sum of its proper divisors (34587572208).

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

20081535888 is a wasteful number, since it uses less digits than its factorization.

20081535888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180232 (or 180226 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 48.

The spelling of 20081535888 in words is "twenty billion, eighty-one million, five hundred thirty-five thousand, eight hundred eighty-eight".