20328203665 has 16 divisors (see below), whose sum is σ = 30413105280. Its totient is φ = 12672126720.

The previous prime is 20328203659. The next prime is 20328203669. The reversal of 20328203665 is 56630282302.

It is not a de Polignac number, because 20328203665 - 2³ = 20328203657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20328203669) 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, 26399880 + ... + 26400649.

It is an arithmetic number, because the mean of its divisors is an integer number (1900819080).

Almost surely, 2^20328203665 is an apocalyptic number.

It is an amenable number.

20328203665 is a deficient number, since it is larger than the sum of its proper divisors (10084901615).

20328203665 is a wasteful number, since it uses less digits than its factorization.

20328203665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52800552.

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 20328203665 its reverse (56630282302), we get a palindrome (76958485967).

The spelling of 20328203665 in words is "twenty billion, three hundred twenty-eight million, two hundred three thousand, six hundred sixty-five".