20112205 has 4 divisors (see below), whose sum is σ = 24134652. Its totient is φ = 16089760.

The previous prime is 20112199. The next prime is 20112217. The reversal of 20112205 is 50221102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10458756 + 9653449 = 3234^2 + 3107^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20112205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2011216 + ... + 2011225.

It is an arithmetic number, because the mean of its divisors is an integer number (6033663).

Almost surely, 2^20112205 is an apocalyptic number.

It is an amenable number.

20112205 is a deficient number, since it is larger than the sum of its proper divisors (4022447).

20112205 is an equidigital number, since it uses as much as digits as its factorization.

20112205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022446.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20112205 is about 4484.6633095473. The cubic root of 20112205 is about 271.9484340324.

Adding to 20112205 its reverse (50221102), we get a palindrome (70333307).

It can be divided in two parts, 20 and 112205, that added together give a square (112225 = 335²).

The spelling of 20112205 in words is "twenty million, one hundred twelve thousand, two hundred five".