20404450111 has 2 divisors, whose sum is σ = 20404450112. Its totient is φ = 20404450110.

The previous prime is 20404450097. The next prime is 20404450117. The reversal of 20404450111 is 11105440402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20404450111 - 2⁹ = 20404449599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404450117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202225055 + 10202225056.

It is an arithmetic number, because the mean of its divisors is an integer number (10202225056).

Almost surely, 2^20404450111 is an apocalyptic number.

20404450111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404450111 is an equidigital number, since it uses as much as digits as its factorization.

20404450111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 20404450111 its reverse (11105440402), we get a palindrome (31509890513).

The spelling of 20404450111 in words is "twenty billion, four hundred four million, four hundred fifty thousand, one hundred eleven".