20111102205 has 8 divisors (see below), whose sum is σ = 32177763552. Its totient is φ = 10725921168.

The previous prime is 20111102183. The next prime is 20111102251. The reversal of 20111102205 is 50220111102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20111102205 - 2¹³ = 20111094013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1340740147 = 20111102205 / (2 + 0 + 1 + 1 + 1 + 1 + 0 + 2 + 2 + 0 + 5).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670370059 + ... + 670370088.

It is an arithmetic number, because the mean of its divisors is an integer number (4022220444).

Almost surely, 2^20111102205 is an apocalyptic number.

It is an amenable number.

20111102205 is a deficient number, since it is larger than the sum of its proper divisors (12066661347).

20111102205 is a wasteful number, since it uses less digits than its factorization.

20111102205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340740155.

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

Adding to 20111102205 its reverse (50220111102), we get a palindrome (70331213307).

The spelling of 20111102205 in words is "twenty billion, one hundred eleven million, one hundred two thousand, two hundred five".