20518365854 has 16 divisors (see below), whose sum is σ = 35182233600. Its totient is φ = 8791612344.

The previous prime is 20518365823. The next prime is 20518365859. The reversal of 20518365854 is 45856381502.

It is a junction number, because it is equal to n+sod(n) for n = 20518365799 and 20518365808.

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 7 ways as a sum of consecutive naturals, for example, 98894 + ... + 225425.

It is an arithmetic number, because the mean of its divisors is an integer number (2198889600).

Almost surely, 2^20518365854 is an apocalyptic number.

20518365854 is a deficient number, since it is larger than the sum of its proper divisors (14663867746).

20518365854 is a wasteful number, since it uses less digits than its factorization.

20518365854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328847.

The product of its (nonzero) digits is 1152000, while the sum is 47.

The spelling of 20518365854 in words is "twenty billion, five hundred eighteen million, three hundred sixty-five thousand, eight hundred fifty-four".