20309904800 has 36 divisors (see below), whose sum is σ = 49581557046. Its totient is φ = 8123961600.

The previous prime is 20309904793. The next prime is 20309904817. The reversal of 20309904800 is 840990302.

It can be written as a sum of positive squares in 3 ways, for example, as 19625768464 + 684136336 = 140092^2 + 26156^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12692891 + ... + 12694490.

Almost surely, 2^20309904800 is an apocalyptic number.

20309904800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20309904800 is an abundant number, since it is smaller than the sum of its proper divisors (29271652246).

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

20309904800 is a wasteful number, since it uses less digits than its factorization.

20309904800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25387401 (or 25387388 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 20309904800 in words is "twenty billion, three hundred nine million, nine hundred four thousand, eight hundred".