20187552800 has 144 divisors (see below), whose sum is σ = 50711754240. Its totient is φ = 7843522560.

The previous prime is 20187552799. The next prime is 20187552841. The reversal of 20187552800 is 825578102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5149241 + ... + 5153159.

It is an arithmetic number, because the mean of its divisors is an integer number (352164960).

Almost surely, 2^20187552800 is an apocalyptic number.

20187552800 is a gapful number since it is divisible by the number (20) 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 20187552800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25355877120).

20187552800 is an abundant number, since it is smaller than the sum of its proper divisors (30524201440).

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

20187552800 is a wasteful number, since it uses less digits than its factorization.

20187552800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123 (or 4110 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 38.

The spelling of 20187552800 in words is "twenty billion, one hundred eighty-seven million, five hundred fifty-two thousand, eight hundred".