20249519 has 2 divisors, whose sum is σ = 20249520. Its totient is φ = 20249518.

The previous prime is 20249503. The next prime is 20249539. The reversal of 20249519 is 91594202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20249519 - 2⁴ = 20249503 is a prime.

It is a super-2 number, since 2×20249519² = 820086039462722, 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 (20249539) 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, 10124759 + 10124760.

It is an arithmetic number, because the mean of its divisors is an integer number (10124760).

Almost surely, 2^20249519 is an apocalyptic number.

20249519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20249519 is an equidigital number, since it uses as much as digits as its factorization.

20249519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 20249519 is about 4499.9465552382. The cubic root of 20249519 is about 272.5659307966.

The spelling of 20249519 in words is "twenty million, two hundred forty-nine thousand, five hundred nineteen".