20405030111 has 2 divisors, whose sum is σ = 20405030112. Its totient is φ = 20405030110.

The previous prime is 20405030059. The next prime is 20405030179. The reversal of 20405030111 is 11103050402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20405030111 - 2³⁴ = 3225160927 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20405030111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20405032111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202515055 + 10202515056.

It is an arithmetic number, because the mean of its divisors is an integer number (10202515056).

Almost surely, 2^20405030111 is an apocalyptic number.

20405030111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405030111 is an equidigital number, since it uses as much as digits as its factorization.

20405030111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20405030111 its reverse (11103050402), we get a palindrome (31508080513).

The spelling of 20405030111 in words is "twenty billion, four hundred five million, thirty thousand, one hundred eleven".