20305145201111 has 4 divisors (see below), whose sum is σ = 20305228059000. Its totient is φ = 20305062343224.

The previous prime is 20305145201087. The next prime is 20305145201153. The reversal of 20305145201111 is 11110254150302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20305145201111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305145201161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41060261 + ... + 41551838.

It is an arithmetic number, because the mean of its divisors is an integer number (5076307014750).

Almost surely, 2^{20305145201111} is an apocalyptic number.

20305145201111 is a deficient number, since it is larger than the sum of its proper divisors (82857889).

20305145201111 is an equidigital number, since it uses as much as digits as its factorization.

20305145201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82857888.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 20305145201111 its reverse (11110254150302), we get a palindrome (31415399351413).

The spelling of 20305145201111 in words is "twenty trillion, three hundred five billion, one hundred forty-five million, two hundred one thousand, one hundred eleven".