20845108428 has 24 divisors (see below), whose sum is σ = 49254266880. Its totient is φ = 6860415120.

The previous prime is 20845108397. The next prime is 20845108477. The reversal of 20845108428 is 82480154802.

It is a self number, because there is not a number n which added to its sum of digits gives 20845108428.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10993308 + ... + 10995203.

It is an arithmetic number, because the mean of its divisors is an integer number (2052261120).

Almost surely, 2^20845108428 is an apocalyptic number.

It is an amenable number.

20845108428 is an abundant number, since it is smaller than the sum of its proper divisors (28409158452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20845108428 is a wasteful number, since it uses less digits than its factorization.

20845108428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21988597 (or 21988595 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 42.

The spelling of 20845108428 in words is "twenty billion, eight hundred forty-five million, one hundred eight thousand, four hundred twenty-eight".