20125205 has 4 divisors (see below), whose sum is σ = 24150252. Its totient is φ = 16100160.

The previous prime is 20125177. The next prime is 20125241. The reversal of 20125205 is 50252102.

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 15311569 + 4813636 = 3913^2 + 2194^2 .

It is not a de Polignac number, because 20125205 - 2²⁴ = 3347989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012516 + ... + 2012525.

It is an arithmetic number, because the mean of its divisors is an integer number (6037563).

Almost surely, 2^20125205 is an apocalyptic number.

It is an amenable number.

20125205 is a deficient number, since it is larger than the sum of its proper divisors (4025047).

20125205 is an equidigital number, since it uses as much as digits as its factorization.

20125205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025046.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20125205 is about 4486.1124595801. The cubic root of 20125205 is about 272.0070148494.

Adding to 20125205 its reverse (50252102), we get a palindrome (70377307).

The spelling of 20125205 in words is "twenty million, one hundred twenty-five thousand, two hundred five".