20249503 has 2 divisors, whose sum is σ = 20249504. Its totient is φ = 20249502.

The previous prime is 20249501. The next prime is 20249519. The reversal of 20249503 is 30594202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20249503 - 2¹ = 20249501 is a prime.

Together with 20249501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20249501) 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, 10124751 + 10124752.

It is an arithmetic number, because the mean of its divisors is an integer number (10124752).

Almost surely, 2^20249503 is an apocalyptic number.

20249503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20249503 is an equidigital number, since it uses as much as digits as its factorization.

20249503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20249503 is about 4499.9447774389. The cubic root of 20249503 is about 272.5658590080.

The spelling of 20249503 in words is "twenty million, two hundred forty-nine thousand, five hundred three".