16820609844 has 12 divisors (see below), whose sum is σ = 39248089664. Its totient is φ = 5606869944.

The previous prime is 16820609843. The next prime is 16820609873. The reversal of 16820609844 is 44890602861.

16820609844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 16820609793 and 16820609802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16820609843) 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 3 ways as a sum of consecutive naturals, for example, 700858732 + ... + 700858755.

Almost surely, 2^16820609844 is an apocalyptic number.

It is an amenable number.

16820609844 is an abundant number, since it is smaller than the sum of its proper divisors (22427479820).

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

16820609844 is a wasteful number, since it uses less digits than its factorization.

16820609844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401717494 (or 1401717492 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 16820609844 in words is "sixteen billion, eight hundred twenty million, six hundred nine thousand, eight hundred forty-four".