20405118200911 has 2 divisors, whose sum is σ = 20405118200912. Its totient is φ = 20405118200910.

The previous prime is 20405118200867. The next prime is 20405118200917. The reversal of 20405118200911 is 11900281150402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20405118200911 - 2⁷ = 20405118200783 is a prime.

It is a super-2 number, since 2×20405118200911² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20405118200917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202559100455 + 10202559100456.

It is an arithmetic number, because the mean of its divisors is an integer number (10202559100456).

Almost surely, 2^{20405118200911} is an apocalyptic number.

20405118200911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405118200911 is an equidigital number, since it uses as much as digits as its factorization.

20405118200911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 34.

The spelling of 20405118200911 in words is "twenty trillion, four hundred five billion, one hundred eighteen million, two hundred thousand, nine hundred eleven".