20518365855 has 16 divisors (see below), whose sum is σ = 35354723040. Its totient is φ = 10101349248.

The previous prime is 20518365823. The next prime is 20518365859. The reversal of 20518365855 is 55856381502.

It is not a de Polignac number, because 20518365855 - 2⁵ = 20518365823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20518365859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52611000 + ... + 52611389.

It is an arithmetic number, because the mean of its divisors is an integer number (2209670190).

Almost surely, 2^20518365855 is an apocalyptic number.

20518365855 is a deficient number, since it is larger than the sum of its proper divisors (14836357185).

20518365855 is a wasteful number, since it uses less digits than its factorization.

20518365855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105222410.

The product of its (nonzero) digits is 1440000, while the sum is 48.

The spelling of 20518365855 in words is "twenty billion, five hundred eighteen million, three hundred sixty-five thousand, eight hundred fifty-five".