20503519 has 2 divisors, whose sum is σ = 20503520. Its totient is φ = 20503518.

The previous prime is 20503517. The next prime is 20503523. The reversal of 20503519 is 91530502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20503519 - 2¹ = 20503517 is a prime.

It is a super-2 number, since 2×20503519² = 840788582766722, which contains 22 as substring.

Together with 20503517, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20503493 and 20503502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20503517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251759 + 10251760.

It is an arithmetic number, because the mean of its divisors is an integer number (10251760).

Almost surely, 2^20503519 is an apocalyptic number.

20503519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503519 is an equidigital number, since it uses as much as digits as its factorization.

20503519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20503519 is about 4528.0811609334. The cubic root of 20503519 is about 273.7008429767.

The spelling of 20503519 in words is "twenty million, five hundred three thousand, five hundred nineteen".