20400311111 has 2 divisors, whose sum is σ = 20400311112. Its totient is φ = 20400311110.

The previous prime is 20400311093. The next prime is 20400311167. The reversal of 20400311111 is 11111300402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20400311111 - 2¹⁴ = 20400294727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400311611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200155555 + 10200155556.

It is an arithmetic number, because the mean of its divisors is an integer number (10200155556).

Almost surely, 2^20400311111 is an apocalyptic number.

20400311111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400311111 is an equidigital number, since it uses as much as digits as its factorization.

20400311111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20400311111 its reverse (11111300402), we get a palindrome (31511611513).

The spelling of 20400311111 in words is "twenty billion, four hundred million, three hundred eleven thousand, one hundred eleven".