20540205 has 48 divisors (see below), whose sum is σ = 41019264. Its totient is φ = 9313920.

The previous prime is 20540171. The next prime is 20540209. The reversal of 20540205 is 50204502.

It is not a de Polignac number, because 20540205 - 2⁶ = 20540141 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61890 + ... + 62220.

It is an arithmetic number, because the mean of its divisors is an integer number (854568).

Almost surely, 2^20540205 is an apocalyptic number.

It is an amenable number.

20540205 is a deficient number, since it is larger than the sum of its proper divisors (20479059).

20540205 is a wasteful number, since it uses less digits than its factorization.

20540205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20540205 is about 4532.1302938022. The cubic root of 20540205 is about 273.8639858083.

Adding to 20540205 its reverse (50204502), we get a palindrome (70744707).

It can be divided in two parts, 20 and 540205, that added together give a square (540225 = 735²).

The spelling of 20540205 in words is "twenty million, five hundred forty thousand, two hundred five".