20104057 has 4 divisors (see below), whose sum is σ = 20113920. Its totient is φ = 20094196.

The previous prime is 20104043. The next prime is 20104067. The reversal of 20104057 is 75040102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75040102 = 2 ⋅37520051.

It is a cyclic number.

It is not a de Polignac number, because 20104057 - 2¹¹ = 20102009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20104067) 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, 613 + ... + 6370.

It is an arithmetic number, because the mean of its divisors is an integer number (5028480).

Almost surely, 2^20104057 is an apocalyptic number.

It is an amenable number.

20104057 is a deficient number, since it is larger than the sum of its proper divisors (9863).

20104057 is an equidigital number, since it uses as much as digits as its factorization.

20104057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9862.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20104057 is about 4483.7547881212. The cubic root of 20104057 is about 271.9117045085.

Adding to 20104057 its reverse (75040102), we get a palindrome (95144159).

The spelling of 20104057 in words is "twenty million, one hundred four thousand, fifty-seven".