20104121 has 4 divisors (see below), whose sum is σ = 20330100. Its totient is φ = 19878144.

The previous prime is 20104067. The next prime is 20104129. The reversal of 20104121 is 12140102.

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 2371600 + 17732521 = 1540^2 + 4211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20104121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20104129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112856 + ... + 113033.

It is an arithmetic number, because the mean of its divisors is an integer number (5082525).

Almost surely, 2^20104121 is an apocalyptic number.

It is an amenable number.

20104121 is a deficient number, since it is larger than the sum of its proper divisors (225979).

20104121 is an equidigital number, since it uses as much as digits as its factorization.

20104121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225978.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20104121 is about 4483.7619249911. The cubic root of 20104121 is about 271.9119930461.

Adding to 20104121 its reverse (12140102), we get a palindrome (32244223).

The spelling of 20104121 in words is "twenty million, one hundred four thousand, one hundred twenty-one".