20303431 has 2 divisors, whose sum is σ = 20303432. Its totient is φ = 20303430.

The previous prime is 20303351. The next prime is 20303441. The reversal of 20303431 is 13430302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20303431 - 2¹³ = 20295239 is a prime.

It is a super-2 number, since 2×20303431² = 824458620743522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20303441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151715 + 10151716.

It is an arithmetic number, because the mean of its divisors is an integer number (10151716).

Almost surely, 2^20303431 is an apocalyptic number.

20303431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20303431 is an equidigital number, since it uses as much as digits as its factorization.

20303431 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 20303431 is about 4505.9328667880. The cubic root of 20303431 is about 272.8076081890.

Adding to 20303431 its reverse (13430302), we get a palindrome (33733733).

The spelling of 20303431 in words is "twenty million, three hundred three thousand, four hundred thirty-one".