20538718858 has 64 divisors (see below), whose sum is σ = 36914227200. Its totient is φ = 8385822720.

The previous prime is 20538718847. The next prime is 20538718859. The reversal of 20538718858 is 85881783502.

It is a junction number, because it is equal to n+sod(n) for n = 20538718799 and 20538718808.

It is not an unprimeable number, because it can be changed into a prime (20538718859) by changing a digit.

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, 9925848 + ... + 9927916.

It is an arithmetic number, because the mean of its divisors is an integer number (576784800).

Almost surely, 2^20538718858 is an apocalyptic number.

20538718858 is a deficient number, since it is larger than the sum of its proper divisors (16375508342).

20538718858 is a wasteful number, since it uses less digits than its factorization.

20538718858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455.

The product of its (nonzero) digits is 4300800, while the sum is 55.

The spelling of 20538718858 in words is "twenty billion, five hundred thirty-eight million, seven hundred eighteen thousand, eight hundred fifty-eight".