20351239 has 2 divisors, whose sum is σ = 20351240. Its totient is φ = 20351238.

The previous prime is 20351207. The next prime is 20351257. The reversal of 20351239 is 93215302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20351239 - 2⁵ = 20351207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20351339) 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, 10175619 + 10175620.

It is an arithmetic number, because the mean of its divisors is an integer number (10175620).

Almost surely, 2^20351239 is an apocalyptic number.

20351239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20351239 is an equidigital number, since it uses as much as digits as its factorization.

20351239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20351239 is about 4511.2347533685. The cubic root of 20351239 is about 273.0215648455.

The spelling of 20351239 in words is "twenty million, three hundred fifty-one thousand, two hundred thirty-nine".