20204081 has 2 divisors, whose sum is σ = 20204082. Its totient is φ = 20204080.

The previous prime is 20204071. The next prime is 20204083. The reversal of 20204081 is 18040202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19891600 + 312481 = 4460^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 20204081 - 2⁶ = 20204017 is a prime.

It is a super-2 number, since 2×20204081² = 816409778109122, which contains 22 as substring.

Together with 20204083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20204083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102040 + 10102041.

It is an arithmetic number, because the mean of its divisors is an integer number (10102041).

Almost surely, 2^20204081 is an apocalyptic number.

It is an amenable number.

20204081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204081 is an equidigital number, since it uses as much as digits as its factorization.

20204081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20204081 is about 4494.8949932117. The cubic root of 20204081 is about 272.3619074186.

Adding to 20204081 its reverse (18040202), we get a palindrome (38244283).

The spelling of 20204081 in words is "twenty million, two hundred four thousand, eighty-one".