20204636855 has 32 divisors (see below), whose sum is σ = 26586923328. Its totient is φ = 14649062400.

The previous prime is 20204636819. The next prime is 20204636873. The reversal of 20204636855 is 55863640202.

It is a happy number.

It is not a de Polignac number, because 20204636855 - 2²² = 20200442551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2323115 + ... + 2331795.

It is an arithmetic number, because the mean of its divisors is an integer number (830841354).

Almost surely, 2^20204636855 is an apocalyptic number.

20204636855 is a deficient number, since it is larger than the sum of its proper divisors (6382286473).

20204636855 is a wasteful number, since it uses less digits than its factorization.

20204636855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9347.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 20204636855 in words is "twenty billion, two hundred four million, six hundred thirty-six thousand, eight hundred fifty-five".