20857871795 has 8 divisors (see below), whose sum is σ = 26501766624. Its totient is φ = 15704750464.

The previous prime is 20857871791. The next prime is 20857871819. The reversal of 20857871795 is 59717875802.

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

It is a cyclic number.

It is not a de Polignac number, because 20857871795 - 2² = 20857871791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20857871791) 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, 122693279 + ... + 122693448.

It is an arithmetic number, because the mean of its divisors is an integer number (3312720828).

Almost surely, 2^20857871795 is an apocalyptic number.

20857871795 is a deficient number, since it is larger than the sum of its proper divisors (5643894829).

20857871795 is a wasteful number, since it uses less digits than its factorization.

20857871795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245386749.

The product of its (nonzero) digits is 9878400, while the sum is 59.

The spelling of 20857871795 in words is "twenty billion, eight hundred fifty-seven million, eight hundred seventy-one thousand, seven hundred ninety-five".