20857864118 has 128 divisors (see below), whose sum is σ = 41890867200. Its totient is φ = 7559764992.

The previous prime is 20857864103. The next prime is 20857864127. The reversal of 20857864118 is 81146875802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13378223 + ... + 13379781.

It is an arithmetic number, because the mean of its divisors is an integer number (327272400).

Almost surely, 2^20857864118 is an apocalyptic number.

20857864118 is an abundant number, since it is smaller than the sum of its proper divisors (21033003082).

20857864118 is a wasteful number, since it uses less digits than its factorization.

20857864118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726.

The product of its (nonzero) digits is 860160, while the sum is 50.

The spelling of 20857864118 in words is "twenty billion, eight hundred fifty-seven million, eight hundred sixty-four thousand, one hundred eighteen".