20303249 has 2 divisors, whose sum is σ = 20303250. Its totient is φ = 20303248.

The previous prime is 20303203. The next prime is 20303251. The reversal of 20303249 is 94230302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15745024 + 4558225 = 3968^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303249 - 2⁸ = 20302993 is a prime.

Together with 20303251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20303279) 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, 10151624 + 10151625.

It is an arithmetic number, because the mean of its divisors is an integer number (10151625).

Almost surely, 2^20303249 is an apocalyptic number.

It is an amenable number.

20303249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20303249 is an equidigital number, since it uses as much as digits as its factorization.

20303249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20303249 is about 4505.9126711467. The cubic root of 20303249 is about 272.8067930372.

The spelling of 20303249 in words is "twenty million, three hundred three thousand, two hundred forty-nine".