20023404221 has 8 divisors (see below), whose sum is σ = 20105034840. Its totient is φ = 19941890368.

The previous prime is 20023404157. The next prime is 20023404251. The reversal of 20023404221 is 12240432002.

It can be written as a sum of positive squares in 4 ways, for example, as 3610207225 + 16413196996 = 60085^2 + 128114^2 .

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 20023404221 - 2⁶ = 20023404157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20023404193 and 20023404202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023404251) 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, 323075 + ... + 380031.

It is an arithmetic number, because the mean of its divisors is an integer number (2513129355).

Almost surely, 2^20023404221 is an apocalyptic number.

It is an amenable number.

20023404221 is a deficient number, since it is larger than the sum of its proper divisors (81630619).

20023404221 is a wasteful number, since it uses less digits than its factorization.

20023404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58383.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20023404221 its reverse (12240432002), we get a palindrome (32263836223).

The spelling of 20023404221 in words is "twenty billion, twenty-three million, four hundred four thousand, two hundred twenty-one".