20431303 has 2 divisors, whose sum is σ = 20431304. Its totient is φ = 20431302.

The previous prime is 20431277. The next prime is 20431309. The reversal of 20431303 is 30313402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20431303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215651 + 10215652.

It is an arithmetic number, because the mean of its divisors is an integer number (10215652).

Almost surely, 2^20431303 is an apocalyptic number.

20431303 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431303 is an equidigital number, since it uses as much as digits as its factorization.

20431303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 20431303 is about 4520.0998882768. The cubic root of 20431303 is about 273.3791285884.

Adding to 20431303 its reverse (30313402), we get a palindrome (50744705).

The spelling of 20431303 in words is "twenty million, four hundred thirty-one thousand, three hundred three".