20857871837 has 8 divisors (see below), whose sum is σ = 22755414240. Its totient is φ = 18960558160.

The previous prime is 20857871831. The next prime is 20857871873. The reversal of 20857871837 is 73817875802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20857871837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857871831) 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 7 ways as a sum of consecutive naturals, for example, 174239 + ... + 268467.

It is an arithmetic number, because the mean of its divisors is an integer number (2844426780).

Almost surely, 2^20857871837 is an apocalyptic number.

It is an amenable number.

20857871837 is a deficient number, since it is larger than the sum of its proper divisors (1897542403).

20857871837 is a wasteful number, since it uses less digits than its factorization.

20857871837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114363.

The product of its (nonzero) digits is 5268480, while the sum is 56.

The spelling of 20857871837 in words is "twenty billion, eight hundred fifty-seven million, eight hundred seventy-one thousand, eight hundred thirty-seven".