20500205 has 16 divisors (see below), whose sum is σ = 27494208. Its totient is φ = 14544000.

The previous prime is 20500189. The next prime is 20500217. The reversal of 20500205 is 50200502.

It is not a de Polignac number, because 20500205 - 2⁴ = 20500189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20500205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2291 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (1718388).

Almost surely, 2^20500205 is an apocalyptic number.

It is an amenable number.

20500205 is a deficient number, since it is larger than the sum of its proper divisors (6994003).

20500205 is a wasteful number, since it uses less digits than its factorization.

20500205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9148.

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 20500205 is about 4527.7152074750. The cubic root of 20500205 is about 273.6860960208.

Adding to 20500205 its reverse (50200502), we get a palindrome (70700707).

It can be divided in two parts, 20500 and 205, that multiplied together give a square (4202500 = 2050²).

The spelling of 20500205 in words is "twenty million, five hundred thousand, two hundred five".