20431103311 has 2 divisors, whose sum is σ = 20431103312. Its totient is φ = 20431103310.

The previous prime is 20431103309. The next prime is 20431103323. The reversal of 20431103311 is 11330113402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20431103311 - 2¹ = 20431103309 is a prime.

Together with 20431103309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431103911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215551655 + 10215551656.

It is an arithmetic number, because the mean of its divisors is an integer number (10215551656).

Almost surely, 2^20431103311 is an apocalyptic number.

20431103311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431103311 is an equidigital number, since it uses as much as digits as its factorization.

20431103311 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 19.

Adding to 20431103311 its reverse (11330113402), we get a palindrome (31761216713).

The spelling of 20431103311 in words is "twenty billion, four hundred thirty-one million, one hundred three thousand, three hundred eleven".