20663030565 has 12 divisors (see below), whose sum is σ = 35815919724. Its totient is φ = 11020282944.

The previous prime is 20663030551. The next prime is 20663030567. The reversal of 20663030565 is 56503036602.

20663030565 is a `hidden beast` number, since 2 + 0 + 6 + 63 + 0 + 30 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3638261124 + 17024769441 = 60318^2 + 130479^2 .

It is not a de Polignac number, because 20663030565 - 2⁵ = 20663030533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663030567) 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 11 ways as a sum of consecutive naturals, for example, 229589184 + ... + 229589273.

It is an arithmetic number, because the mean of its divisors is an integer number (2984659977).

Almost surely, 2^20663030565 is an apocalyptic number.

It is an amenable number.

20663030565 is a deficient number, since it is larger than the sum of its proper divisors (15152889159).

20663030565 is a wasteful number, since it uses less digits than its factorization.

20663030565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459178468 (or 459178465 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The spelling of 20663030565 in words is "twenty billion, six hundred sixty-three million, thirty thousand, five hundred sixty-five".