20104181 has 2 divisors, whose sum is σ = 20104182. Its totient is φ = 20104180.

The previous prime is 20104171. The next prime is 20104187. The reversal of 20104181 is 18140102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10080625 + 10023556 = 3175^2 + 3166^2 .

It is a cyclic number.

It is not a de Polignac number, because 20104181 - 2¹⁰ = 20103157 is a prime.

It is a super-2 number, since 2×20104181² = 808356187361522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20104187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052090 + 10052091.

It is an arithmetic number, because the mean of its divisors is an integer number (10052091).

Almost surely, 2^20104181 is an apocalyptic number.

It is an amenable number.

20104181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20104181 is an equidigital number, since it uses as much as digits as its factorization.

20104181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 20104181 is about 4483.7686157963. The cubic root of 20104181 is about 271.9122635496.

Adding to 20104181 its reverse (18140102), we get a palindrome (38244283).

The spelling of 20104181 in words is "twenty million, one hundred four thousand, one hundred eighty-one".