20305344511 has 2 divisors, whose sum is σ = 20305344512. Its totient is φ = 20305344510.

The previous prime is 20305344509. The next prime is 20305344523. The reversal of 20305344511 is 11544350302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20305344511 - 2¹ = 20305344509 is a prime.

Together with 20305344509, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20305344511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20305344551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152672255 + 10152672256.

It is an arithmetic number, because the mean of its divisors is an integer number (10152672256).

Almost surely, 2^20305344511 is an apocalyptic number.

20305344511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305344511 is an equidigital number, since it uses as much as digits as its factorization.

20305344511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20305344511 its reverse (11544350302), we get a palindrome (31849694813).

It can be divided in two parts, 20305 and 344511, that added together give a square (364816 = 604²).

The spelling of 20305344511 in words is "twenty billion, three hundred five million, three hundred forty-four thousand, five hundred eleven".