20320306221 has 8 divisors (see below), whose sum is σ = 27373058944. Its totient is φ = 13407212160.

The previous prime is 20320306213. The next prime is 20320306229. The reversal of 20320306221 is 12260302302.

It is an interprime number because it is at equal distance from previous prime (20320306213) and next prime (20320306229).

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

It is not a de Polignac number, because 20320306221 - 2³ = 20320306213 is a prime.

It is a super-2 number, since 2×20320306221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320306229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34914325 + ... + 34914906.

It is an arithmetic number, because the mean of its divisors is an integer number (3421632368).

Almost surely, 2^20320306221 is an apocalyptic number.

It is an amenable number.

20320306221 is a deficient number, since it is larger than the sum of its proper divisors (7052752723).

20320306221 is an equidigital number, since it uses as much as digits as its factorization.

20320306221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69829331.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20320306221 its reverse (12260302302), we get a palindrome (32580608523).

The spelling of 20320306221 in words is "twenty billion, three hundred twenty million, three hundred six thousand, two hundred twenty-one".