20002320221 has 4 divisors (see below), whose sum is σ = 21540960252. Its totient is φ = 18463680192.

The previous prime is 20002320209. The next prime is 20002320227. The reversal of 20002320221 is 12202320002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6751087225 + 13251232996 = 82165^2 + 115114^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002320221 - 2¹⁴ = 20002303837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002320196 and 20002320205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002320227) 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 3 ways as a sum of consecutive naturals, for example, 769319996 + ... + 769320021.

It is an arithmetic number, because the mean of its divisors is an integer number (5385240063).

Almost surely, 2^20002320221 is an apocalyptic number.

It is an amenable number.

20002320221 is a deficient number, since it is larger than the sum of its proper divisors (1538640031).

20002320221 is a wasteful number, since it uses less digits than its factorization.

20002320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538640030.

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 20002320221 its reverse (12202320002), we get a palindrome (32204640223).

The spelling of 20002320221 in words is "twenty billion, two million, three hundred twenty thousand, two hundred twenty-one".