20012000111 has 4 divisors (see below), whose sum is σ = 20014872912. Its totient is φ = 20009127312.

The previous prime is 20012000081. The next prime is 20012000161. The reversal of 20012000111 is 11100021002.

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-20012000111 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 (20012000161) 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, 1425926 + ... + 1439891.

It is an arithmetic number, because the mean of its divisors is an integer number (5003718228).

Almost surely, 2^20012000111 is an apocalyptic number.

20012000111 is a deficient number, since it is larger than the sum of its proper divisors (2872801).

20012000111 is an equidigital number, since it uses as much as digits as its factorization.

20012000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872800.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20012000111 its reverse (11100021002), we get a palindrome (31112021113).

The spelling of 20012000111 in words is "twenty billion, twelve million, one hundred eleven", and thus it is an aban number.