20663905090 has 8 divisors (see below), whose sum is σ = 37195029180. Its totient is φ = 8265562032.

The previous prime is 20663905063. The next prime is 20663905109. The reversal of 20663905090 is 9050936602.

It can be written as a sum of positive squares in 2 ways, for example, as 20583927841 + 79977249 = 143471^2 + 8943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1033195245 + ... + 1033195264.

Almost surely, 2^20663905090 is an apocalyptic number.

20663905090 is a deficient number, since it is larger than the sum of its proper divisors (16531124090).

20663905090 is a wasteful number, since it uses less digits than its factorization.

20663905090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066390516.

The product of its (nonzero) digits is 87480, while the sum is 40.

The spelling of 20663905090 in words is "twenty billion, six hundred sixty-three million, nine hundred five thousand, ninety".