20566244544 has 56 divisors (see below), whose sum is σ = 55337171520. Its totient is φ = 6739217664.

The previous prime is 20566244527. The next prime is 20566244549. The reversal of 20566244544 is 44544266502.

It is a junction number, because it is equal to n+sod(n) for n = 20566244496 and 20566244505.

It is not an unprimeable number, because it can be changed into a prime (20566244549) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 896434 + ... + 919089.

Almost surely, 2^20566244544 is an apocalyptic number.

20566244544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20566244544 is an abundant number, since it is smaller than the sum of its proper divisors (34770926976).

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

20566244544 is a wasteful number, since it uses less digits than its factorization.

20566244544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815597 (or 1815587 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 42.

The spelling of 20566244544 in words is "twenty billion, five hundred sixty-six million, two hundred forty-four thousand, five hundred forty-four".