20563989726 has 32 divisors (see below), whose sum is σ = 48624215040. Its totient is φ = 5672824416.

The previous prime is 20563989713. The next prime is 20563989727. The reversal of 20563989726 is 62798936502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563989727) 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 15 ways as a sum of consecutive naturals, for example, 8440486 + ... + 8442921.

It is an arithmetic number, because the mean of its divisors is an integer number (1519506720).

Almost surely, 2^20563989726 is an apocalyptic number.

20563989726 is an abundant number, since it is smaller than the sum of its proper divisors (28060225314).

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

20563989726 is a wasteful number, since it uses less digits than its factorization.

20563989726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16883448.

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 20563989726 in words is "twenty billion, five hundred sixty-three million, nine hundred eighty-nine thousand, seven hundred twenty-six".