20871805850 has 48 divisors (see below), whose sum is σ = 44379266688. Its totient is φ = 7154149440.

The previous prime is 20871805817. The next prime is 20871805873. The reversal of 20871805850 is 5850817802.

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 23 ways as a sum of consecutive naturals, for example, 2164139 + ... + 2173761.

It is an arithmetic number, because the mean of its divisors is an integer number (924568056).

Almost surely, 2^20871805850 is an apocalyptic number.

20871805850 is an abundant number, since it is smaller than the sum of its proper divisors (23507460838).

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

20871805850 is a wasteful number, since it uses less digits than its factorization.

20871805850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15839 (or 15834 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 44.

The spelling of 20871805850 in words is "twenty billion, eight hundred seventy-one million, eight hundred five thousand, eight hundred fifty".