20117519 has 2 divisors, whose sum is σ = 20117520. Its totient is φ = 20117518.

The previous prime is 20117497. The next prime is 20117527. The reversal of 20117519 is 91571102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20117519 - 2²⁰ = 19068943 is a prime.

It is a super-2 number, since 2×20117519² = 809429141430722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20117549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058759 + 10058760.

It is an arithmetic number, because the mean of its divisors is an integer number (10058760).

Almost surely, 2^20117519 is an apocalyptic number.

20117519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117519 is an equidigital number, since it uses as much as digits as its factorization.

20117519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 20117519 is about 4485.2557340691. The cubic root of 20117519 is about 271.9723831174.

The spelling of 20117519 in words is "twenty million, one hundred seventeen thousand, five hundred nineteen".