20104440321 has 8 divisors (see below), whose sum is σ = 30635337664. Its totient is φ = 11488251600.

The previous prime is 20104440281. The next prime is 20104440401. The reversal of 20104440321 is 12304440102.

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

It is a de Polignac number, because none of the positive numbers 2^k-20104440321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 957354301 = 20104440321 / (2 + 0 + 1 + 0 + 4 + 4 + 4 + 0 + 3 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20104442321) 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, 478677130 + ... + 478677171.

It is an arithmetic number, because the mean of its divisors is an integer number (3829417208).

Almost surely, 2^20104440321 is an apocalyptic number.

20104440321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20104440321 is a deficient number, since it is larger than the sum of its proper divisors (10530897343).

20104440321 is an equidigital number, since it uses as much as digits as its factorization.

20104440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957354311.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20104440321 its reverse (12304440102), we get a palindrome (32408880423).

The spelling of 20104440321 in words is "twenty billion, one hundred four million, four hundred forty thousand, three hundred twenty-one".