20566244545 has 32 divisors (see below), whose sum is σ = 30973095936. Its totient is φ = 12735576000.

The previous prime is 20566244527. The next prime is 20566244549. The reversal of 20566244545 is 54544266502.

It is a happy number.

It is not a de Polignac number, because 20566244545 - 2¹¹ = 20566242497 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118749 + ... + 235018.

It is an arithmetic number, because the mean of its divisors is an integer number (967909248).

Almost surely, 2^20566244545 is an apocalyptic number.

It is an amenable number.

20566244545 is a deficient number, since it is larger than the sum of its proper divisors (10406851391).

20566244545 is a wasteful number, since it uses less digits than its factorization.

20566244545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353941.

The product of its (nonzero) digits is 1152000, while the sum is 43.

The spelling of 20566244545 in words is "twenty billion, five hundred sixty-six million, two hundred forty-four thousand, five hundred forty-five".