20356433 has 2 divisors, whose sum is σ = 20356434. Its totient is φ = 20356432.

The previous prime is 20356421. The next prime is 20356439. The reversal of 20356433 is 33465302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 3775249 = 4072^2 + 1943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20356433 is a prime.

It is not a weakly prime, because it can be changed into another prime (20356439) 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, 10178216 + 10178217.

It is an arithmetic number, because the mean of its divisors is an integer number (10178217).

Almost surely, 2^20356433 is an apocalyptic number.

It is an amenable number.

20356433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356433 is an equidigital number, since it uses as much as digits as its factorization.

20356433 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 26.

The square root of 20356433 is about 4511.8103905195. The cubic root of 20356433 is about 273.0447895312.

The spelling of 20356433 in words is "twenty million, three hundred fifty-six thousand, four hundred thirty-three".