20564544204042 has 32 divisors (see below), whose sum is σ = 43548669021312. Its totient is φ = 6451588752384.

The previous prime is 20564544203989. The next prime is 20564544204077. The reversal of 20564544204042 is 24040244546502.

It is a junction number, because it is equal to n+sod(n) for n = 20564544203985 and 20564544204003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26422738 + ... + 27189890.

It is an arithmetic number, because the mean of its divisors is an integer number (1360895906916).

Almost surely, 2^{20564544204042} is an apocalyptic number.

20564544204042 is an abundant number, since it is smaller than the sum of its proper divisors (22984124817270).

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

20564544204042 is a wasteful number, since it uses less digits than its factorization.

20564544204042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029982.

The product of its (nonzero) digits is 1228800, while the sum is 42.

The spelling of 20564544204042 in words is "twenty trillion, five hundred sixty-four billion, five hundred forty-four million, two hundred four thousand, forty-two".