20845908800 has 84 divisors (see below), whose sum is σ = 52545201996. Its totient is φ = 8134963200.

The previous prime is 20845908737. The next prime is 20845908829. The reversal of 20845908800 is 880954802.

It can be written as a sum of positive squares in 6 ways, for example, as 7462195456 + 13383713344 = 86384^2 + 115688^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93287 + ... + 224486.

It is an arithmetic number, because the mean of its divisors is an integer number (625538119).

Almost surely, 2^20845908800 is an apocalyptic number.

20845908800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20845908800 is an abundant number, since it is smaller than the sum of its proper divisors (31699293196).

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

20845908800 is a wasteful number, since it uses less digits than its factorization.

20845908800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317836 (or 317821 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 20845908800 in words is "twenty billion, eight hundred forty-five million, nine hundred eight thousand, eight hundred".