20449523 has 2 divisors, whose sum is σ = 20449524. Its totient is φ = 20449522.

The previous prime is 20449501. The next prime is 20449531. The reversal of 20449523 is 32594402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20449523 - 2⁸ = 20449267 is a prime.

It is not a weakly prime, because it can be changed into another prime (20442523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10224761 + 10224762.

It is an arithmetic number, because the mean of its divisors is an integer number (10224762).

Almost surely, 2^20449523 is an apocalyptic number.

20449523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20449523 is an equidigital number, since it uses as much as digits as its factorization.

20449523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20449523 is about 4522.1148813359. The cubic root of 20449523 is about 273.4603681098.

The spelling of 20449523 in words is "twenty million, four hundred forty-nine thousand, five hundred twenty-three".