20431039 has 2 divisors, whose sum is σ = 20431040. Its totient is φ = 20431038.

The previous prime is 20431027. The next prime is 20431043. The reversal of 20431039 is 93013402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20431039 - 2⁵ = 20431007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215519 + 10215520.

It is an arithmetic number, because the mean of its divisors is an integer number (10215520).

Almost surely, 2^20431039 is an apocalyptic number.

20431039 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431039 is an equidigital number, since it uses as much as digits as its factorization.

20431039 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 20431039 is about 4520.0706852880. The cubic root of 20431039 is about 273.3779511076.

The spelling of 20431039 in words is "twenty million, four hundred thirty-one thousand, thirty-nine".