20912187800 has 48 divisors (see below), whose sum is σ = 55566674160. Its totient is φ = 7169892480.

The previous prime is 20912187763. The next prime is 20912187823. The reversal of 20912187800 is 878121902.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 7467239 + ... + 7470038.

It is an arithmetic number, because the mean of its divisors is an integer number (1157639045).

Almost surely, 2^20912187800 is an apocalyptic number.

20912187800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20912187800 is an abundant number, since it is smaller than the sum of its proper divisors (34654486360).

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

20912187800 is a wasteful number, since it uses less digits than its factorization.

20912187800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14937300 (or 14937291 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 20912187800 in words is "twenty billion, nine hundred twelve million, one hundred eighty-seven thousand, eight hundred".