20845361889 has 12 divisors (see below), whose sum is σ = 32847237072. Its totient is φ = 12633552600.

The previous prime is 20845361827. The next prime is 20845361891. The reversal of 20845361889 is 98816354802.

20845361889 is a `hidden beast` number, since 2 + 0 + 8 + 453 + 6 + 188 + 9 = 666.

It is not a de Polignac number, because 20845361889 - 2¹⁵ = 20845329121 is a prime.

It is a super-2 number, since 2×20845361889² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20845361389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105279507 + ... + 105279704.

It is an arithmetic number, because the mean of its divisors is an integer number (2737269756).

Almost surely, 2^20845361889 is an apocalyptic number.

It is an amenable number.

20845361889 is a deficient number, since it is larger than the sum of its proper divisors (12001875183).

20845361889 is a wasteful number, since it uses less digits than its factorization.

20845361889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210559228 (or 210559225 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 20845361889 in words is "twenty billion, eight hundred forty-five million, three hundred sixty-one thousand, eight hundred eighty-nine".