20104131 has 4 divisors (see below), whose sum is σ = 26805512. Its totient is φ = 13402752.

The previous prime is 20104129. The next prime is 20104141. The reversal of 20104131 is 13140102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20104131 - 2¹ = 20104129 is a prime.

It is a super-2 number, since 2×20104131² = 808352166530322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20104141) 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, 3350686 + ... + 3350691.

It is an arithmetic number, because the mean of its divisors is an integer number (6701378).

Almost surely, 2^20104131 is an apocalyptic number.

20104131 is a deficient number, since it is larger than the sum of its proper divisors (6701381).

20104131 is an equidigital number, since it uses as much as digits as its factorization.

20104131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6701380.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20104131 is about 4483.7630401260. The cubic root of 20104131 is about 271.9120381301.

Adding to 20104131 its reverse (13140102), we get a palindrome (33244233).

The spelling of 20104131 in words is "twenty million, one hundred four thousand, one hundred thirty-one".