20865393044 has 24 divisors (see below), whose sum is σ = 36671029248. Its totient is φ = 10388046240.

The previous prime is 20865393041. The next prime is 20865393067. The reversal of 20865393044 is 44039356802.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20865392986 and 20865393004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20865393041) 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, 959597 + ... + 981099.

It is an arithmetic number, because the mean of its divisors is an integer number (1527959552).

Almost surely, 2^20865393044 is an apocalyptic number.

It is an amenable number.

20865393044 is a deficient number, since it is larger than the sum of its proper divisors (15805636204).

20865393044 is a wasteful number, since it uses less digits than its factorization.

20865393044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22535 (or 22533 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 20865393044 in words is "twenty billion, eight hundred sixty-five million, three hundred ninety-three thousand, forty-four".