20854848891 has 32 divisors (see below), whose sum is σ = 29776158720. Its totient is φ = 12960230400.

The previous prime is 20854848827. The next prime is 20854848907. The reversal of 20854848891 is 19884845802.

It is not a de Polignac number, because 20854848891 - 2⁶ = 20854848827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20854848491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 266611 + ... + 335843.

It is an arithmetic number, because the mean of its divisors is an integer number (930504960).

Almost surely, 2^20854848891 is an apocalyptic number.

20854848891 is a deficient number, since it is larger than the sum of its proper divisors (8921309829).

20854848891 is a wasteful number, since it uses less digits than its factorization.

20854848891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69387.

The product of its (nonzero) digits is 5898240, while the sum is 57.

The spelling of 20854848891 in words is "twenty billion, eight hundred fifty-four million, eight hundred forty-eight thousand, eight hundred ninety-one".