20844389646 has 24 divisors (see below), whose sum is σ = 46619711424. Its totient is φ = 6723996480.

The previous prime is 20844389617. The next prime is 20844389647. The reversal of 20844389646 is 64698344802.

20844389646 is a `hidden beast` number, since 2 + 0 + 84 + 438 + 96 + 46 = 666.

20844389646 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 20844389592 and 20844389601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20844389647) 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, 18677211 + ... + 18678326.

It is an arithmetic number, because the mean of its divisors is an integer number (1942487976).

Almost surely, 2^20844389646 is an apocalyptic number.

20844389646 is an abundant number, since it is smaller than the sum of its proper divisors (25775321778).

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

20844389646 is a wasteful number, since it uses less digits than its factorization.

20844389646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37355576 (or 37355573 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 54.

The spelling of 20844389646 in words is "twenty billion, eight hundred forty-four million, three hundred eighty-nine thousand, six hundred forty-six".