20204117 has 2 divisors, whose sum is σ = 20204118. Its totient is φ = 20204116.

The previous prime is 20204113. The next prime is 20204147. The reversal of 20204117 is 71140202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 481636 = 4441^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 20204117 - 2² = 20204113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20204095 and 20204104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20204113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102058 + 10102059.

It is an arithmetic number, because the mean of its divisors is an integer number (10102059).

Almost surely, 2^20204117 is an apocalyptic number.

It is an amenable number.

20204117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204117 is an equidigital number, since it uses as much as digits as its factorization.

20204117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20204117 is about 4494.8989977529. The cubic root of 20204117 is about 272.3620691850.

Adding to 20204117 its reverse (71140202), we get a palindrome (91344319).

The spelling of 20204117 in words is "twenty million, two hundred four thousand, one hundred seventeen".