20358439 has 2 divisors, whose sum is σ = 20358440. Its totient is φ = 20358438.

The previous prime is 20358431. The next prime is 20358449. The reversal of 20358439 is 93485302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20358439 - 2³ = 20358431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20358431) 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, 10179219 + 10179220.

It is an arithmetic number, because the mean of its divisors is an integer number (10179220).

Almost surely, 2^20358439 is an apocalyptic number.

20358439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20358439 is an equidigital number, since it uses as much as digits as its factorization.

20358439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 20358439 is about 4512.0326904844. The cubic root of 20358439 is about 273.0537581925.

The spelling of 20358439 in words is "twenty million, three hundred fifty-eight thousand, four hundred thirty-nine".