20563989575 has 12 divisors (see below), whose sum is σ = 25504714320. Its totient is φ = 16447728960.

The previous prime is 20563989521. The next prime is 20563989577. The reversal of 20563989575 is 57598936502.

It is not a de Polignac number, because 20563989575 - 2²⁸ = 20295554119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563989577) 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 11 ways as a sum of consecutive naturals, for example, 38102 + ... + 206348.

It is an arithmetic number, because the mean of its divisors is an integer number (2125392860).

Almost surely, 2^20563989575 is an apocalyptic number.

20563989575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20563989575 is a deficient number, since it is larger than the sum of its proper divisors (4940724745).

20563989575 is a wasteful number, since it uses less digits than its factorization.

20563989575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173146 (or 173141 counting only the distinct ones).

The product of its (nonzero) digits is 20412000, while the sum is 59.

The spelling of 20563989575 in words is "twenty billion, five hundred sixty-three million, nine hundred eighty-nine thousand, five hundred seventy-five".