20456393 has 2 divisors, whose sum is σ = 20456394. Its totient is φ = 20456392.

The previous prime is 20456353. The next prime is 20456419. The reversal of 20456393 is 39365402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17330569 + 3125824 = 4163^2 + 1768^2 .

It is a cyclic number.

It is not a de Polignac number, because 20456393 - 2⁶ = 20456329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20456323) 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, 10228196 + 10228197.

It is an arithmetic number, because the mean of its divisors is an integer number (10228197).

Almost surely, 2^20456393 is an apocalyptic number.

It is an amenable number.

20456393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456393 is an equidigital number, since it uses as much as digits as its factorization.

20456393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 20456393 is about 4522.8744178896. The cubic root of 20456393 is about 273.4909876078.

The spelling of 20456393 in words is "twenty million, four hundred fifty-six thousand, three hundred ninety-three".