20185117 has 2 divisors, whose sum is σ = 20185118. Its totient is φ = 20185116.

The previous prime is 20185097. The next prime is 20185129. The reversal of 20185117 is 71158102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 2114116 = 4251^2 + 1454^2 .

It is a cyclic number.

It is not a de Polignac number, because 20185117 - 2¹⁹ = 19660829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20185091 and 20185100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20185147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10092558 + 10092559.

It is an arithmetic number, because the mean of its divisors is an integer number (10092559).

Almost surely, 2^20185117 is an apocalyptic number.

It is an amenable number.

20185117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20185117 is an equidigital number, since it uses as much as digits as its factorization.

20185117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 20185117 is about 4492.7849937427. The cubic root of 20185117 is about 272.2766657609.

It can be divided in two parts, 20185 and 117, that added together give a palindrome (20302).

The spelling of 20185117 in words is "twenty million, one hundred eighty-five thousand, one hundred seventeen".