20871466844 has 24 divisors (see below), whose sum is σ = 37709242368. Its totient is φ = 10097503920.

The previous prime is 20871466843. The next prime is 20871466849. The reversal of 20871466844 is 44866417802.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20871466792 and 20871466801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871466843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289369 + ... + 1305455.

It is an arithmetic number, because the mean of its divisors is an integer number (1571218432).

Almost surely, 2^20871466844 is an apocalyptic number.

It is an amenable number.

20871466844 is a deficient number, since it is larger than the sum of its proper divisors (16837775524).

20871466844 is a wasteful number, since it uses less digits than its factorization.

20871466844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26585 (or 26583 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 50.

The spelling of 20871466844 in words is "twenty billion, eight hundred seventy-one million, four hundred sixty-six thousand, eight hundred forty-four".