20012111205 has 16 divisors (see below), whose sum is σ = 32764015680. Its totient is φ = 10424913408.

The previous prime is 20012111201. The next prime is 20012111261. The reversal of 20012111205 is 50211121002.

It is not a de Polignac number, because 20012111205 - 2² = 20012111201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012111201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15512620 + ... + 15513909.

It is an arithmetic number, because the mean of its divisors is an integer number (2047750980).

Almost surely, 2^20012111205 is an apocalyptic number.

It is an amenable number.

20012111205 is a deficient number, since it is larger than the sum of its proper divisors (12751904475).

20012111205 is a wasteful number, since it uses less digits than its factorization.

20012111205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31026580.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 20012111205 its reverse (50211121002), we get a palindrome (70223232207).

The spelling of 20012111205 in words is "twenty billion, twelve million, one hundred eleven thousand, two hundred five".