20857871853 has 48 divisors (see below), whose sum is σ = 37603028736. Its totient is φ = 10846967040.

The previous prime is 20857871831. The next prime is 20857871873. The reversal of 20857871853 is 35817875802.

20857871853 is a `hidden beast` number, since 2 + 0 + 8 + 578 + 7 + 18 + 53 = 666.

It is not a de Polignac number, because 20857871853 - 2⁸ = 20857871597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20857871853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857871873) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 121200 + ... + 237497.

It is an arithmetic number, because the mean of its divisors is an integer number (783396432).

Almost surely, 2^20857871853 is an apocalyptic number.

It is an amenable number.

20857871853 is a deficient number, since it is larger than the sum of its proper divisors (16745156883).

20857871853 is a wasteful number, since it uses less digits than its factorization.

20857871853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358794 (or 358791 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 54.

The spelling of 20857871853 in words is "twenty billion, eight hundred fifty-seven million, eight hundred seventy-one thousand, eight hundred fifty-three".