20021194800 has 90 divisors (see below), whose sum is σ = 69479119892. Its totient is φ = 5338984320.

The previous prime is 20021194799. The next prime is 20021194807. The reversal of 20021194800 is 849112002.

It is a tau number, because it is divible by the number of its divisors (90).

It is not an unprimeable number, because it can be changed into a prime (20021194807) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2777122 + ... + 2784321.

Almost surely, 2^20021194800 is an apocalyptic number.

20021194800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021194800 is an abundant number, since it is smaller than the sum of its proper divisors (49457925092).

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

20021194800 is a wasteful number, since it uses less digits than its factorization.

20021194800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561467 (or 5561453 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 20021194800 in words is "twenty billion, twenty-one million, one hundred ninety-four thousand, eight hundred".