20005445111 has 4 divisors (see below), whose sum is σ = 20304033912. Its totient is φ = 19706856312.

The previous prime is 20005445107. The next prime is 20005445123. The reversal of 20005445111 is 11154450002.

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

It is a cyclic number.

It is not a de Polignac number, because 20005445111 - 2² = 20005445107 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 (20005445311) 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, 149294300 + ... + 149294433.

It is an arithmetic number, because the mean of its divisors is an integer number (5076008478).

Almost surely, 2^20005445111 is an apocalyptic number.

20005445111 is a deficient number, since it is larger than the sum of its proper divisors (298588801).

20005445111 is an equidigital number, since it uses as much as digits as its factorization.

20005445111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298588800.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 20005445111 its reverse (11154450002), we get a palindrome (31159895113).

The spelling of 20005445111 in words is "twenty billion, five million, four hundred forty-five thousand, one hundred eleven".