20563772926 has 4 divisors (see below), whose sum is σ = 30845659392. Its totient is φ = 10281886462.

The previous prime is 20563772921. The next prime is 20563772953. The reversal of 20563772926 is 62927736502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62927736502 = 2 ⋅31463868251.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20563772926.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563772921) 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 as a sum of consecutive naturals, namely, 5140943230 + ... + 5140943233.

It is an arithmetic number, because the mean of its divisors is an integer number (7711414848).

Almost surely, 2^20563772926 is an apocalyptic number.

20563772926 is a deficient number, since it is larger than the sum of its proper divisors (10281886466).

20563772926 is a wasteful number, since it uses less digits than its factorization.

20563772926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10281886465.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 20563772926 in words is "twenty billion, five hundred sixty-three million, seven hundred seventy-two thousand, nine hundred twenty-six".