20565105844 has 24 divisors (see below), whose sum is σ = 36693165600. Its totient is φ = 10082242080.

The previous prime is 20565105833. The next prime is 20565105859. The reversal of 20565105844 is 44850156502.

It is a junction number, because it is equal to n+sod(n) for n = 20565105797 and 20565105806.

It is a congruent number.

It is an unprimeable number.

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, 20202 + ... + 203809.

It is an arithmetic number, because the mean of its divisors is an integer number (1528881900).

Almost surely, 2^20565105844 is an apocalyptic number.

It is an amenable number.

20565105844 is a deficient number, since it is larger than the sum of its proper divisors (16128059756).

20565105844 is a wasteful number, since it uses less digits than its factorization.

20565105844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224463 (or 224461 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 40.

The spelling of 20565105844 in words is "twenty billion, five hundred sixty-five million, one hundred five thousand, eight hundred forty-four".