20808235578 has 32 divisors (see below), whose sum is σ = 44891675136. Its totient is φ = 6391971648.

The previous prime is 20808235549. The next prime is 20808235589. The reversal of 20808235578 is 87553280802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172401 + ... + 267092.

It is an arithmetic number, because the mean of its divisors is an integer number (1402864848).

Almost surely, 2^20808235578 is an apocalyptic number.

20808235578 is an abundant number, since it is smaller than the sum of its proper divisors (24083439558).

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

20808235578 is a wasteful number, since it uses less digits than its factorization.

20808235578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440118.

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 20808235578 in words is "twenty billion, eight hundred eight million, two hundred thirty-five thousand, five hundred seventy-eight".