20042117 has 2 divisors, whose sum is σ = 20042118. Its totient is φ = 20042116.

The previous prime is 20042107. The next prime is 20042173. The reversal of 20042117 is 71124002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18931201 + 1110916 = 4351^2 + 1054^2 .

It is a cyclic number.

It is not a de Polignac number, because 20042117 - 2⁴ = 20042101 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20042095 and 20042104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20042107) 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, 10021058 + 10021059.

It is an arithmetic number, because the mean of its divisors is an integer number (10021059).

Almost surely, 2^20042117 is an apocalyptic number.

It is an amenable number.

20042117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042117 is an equidigital number, since it uses as much as digits as its factorization.

20042117 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 20042117 is about 4476.8423023377. The cubic root of 20042117 is about 271.6321666118.

Adding to 20042117 its reverse (71124002), we get a palindrome (91166119).

The spelling of 20042117 in words is "twenty million, forty-two thousand, one hundred seventeen".