20031439 has 2 divisors, whose sum is σ = 20031440. Its totient is φ = 20031438.

The previous prime is 20031409. The next prime is 20031449. The reversal of 20031439 is 93413002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20031439 - 2⁷ = 20031311 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20031409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015719 + 10015720.

It is an arithmetic number, because the mean of its divisors is an integer number (10015720).

Almost surely, 2^20031439 is an apocalyptic number.

20031439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031439 is an equidigital number, since it uses as much as digits as its factorization.

20031439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20031439 is about 4475.6495617955. The cubic root of 20031439 is about 271.5839181569.

The spelling of 20031439 in words is "twenty million, thirty-one thousand, four hundred thirty-nine".