20431043 has 2 divisors, whose sum is σ = 20431044. Its totient is φ = 20431042.

The previous prime is 20431039. The next prime is 20431057. The reversal of 20431043 is 34013402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20431043 - 2² = 20431039 is a prime.

It is not a weakly prime, because it can be changed into another prime (20431003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215521 + 10215522.

It is an arithmetic number, because the mean of its divisors is an integer number (10215522).

Almost surely, 2^20431043 is an apocalyptic number.

20431043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431043 is an equidigital number, since it uses as much as digits as its factorization.

20431043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20431043 is about 4520.0711277589. The cubic root of 20431043 is about 273.3779689483.

Adding to 20431043 its reverse (34013402), we get a palindrome (54444445).

The spelling of 20431043 in words is "twenty million, four hundred thirty-one thousand, forty-three".