20320323221 has 8 divisors (see below), whose sum is σ = 22220285088. Its totient is φ = 18429138000.

The previous prime is 20320323211. The next prime is 20320323239. The reversal of 20320323221 is 12232302302.

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

It is a cyclic number.

It is not a de Polignac number, because 20320323221 - 2⁶ = 20320323157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20320323193 and 20320323202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320323211) 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 7 ways as a sum of consecutive naturals, for example, 2189315 + ... + 2198576.

It is an arithmetic number, because the mean of its divisors is an integer number (2777535636).

Almost surely, 2^20320323221 is an apocalyptic number.

It is an amenable number.

20320323221 is a deficient number, since it is larger than the sum of its proper divisors (1899961867).

20320323221 is a wasteful number, since it uses less digits than its factorization.

20320323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388323.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20320323221 its reverse (12232302302), we get a palindrome (32552625523).

The spelling of 20320323221 in words is "twenty billion, three hundred twenty million, three hundred twenty-three thousand, two hundred twenty-one".