20104321 has 4 divisors (see below), whose sum is σ = 20232532. Its totient is φ = 19976112.

The previous prime is 20104313. The next prime is 20104333. The reversal of 20104321 is 12340102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12340102 = 2 ⋅6170051.

It can be written as a sum of positive squares in 2 ways, for example, as 9991921 + 10112400 = 3161^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20104321 - 2³ = 20104313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20104351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63870 + ... + 64183.

It is an arithmetic number, because the mean of its divisors is an integer number (5058133).

Almost surely, 2^20104321 is an apocalyptic number.

It is an amenable number.

20104321 is a deficient number, since it is larger than the sum of its proper divisors (128211).

20104321 is a wasteful number, since it uses less digits than its factorization.

20104321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128210.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20104321 is about 4483.7842276363. The cubic root of 20104321 is about 271.9128947223.

Adding to 20104321 its reverse (12340102), we get a palindrome (32444423).

The spelling of 20104321 in words is "twenty million, one hundred four thousand, three hundred twenty-one".