20550205 has 16 divisors (see below), whose sum is σ = 26656560. Its totient is φ = 15118848.

The previous prime is 20550199. The next prime is 20550209. The reversal of 20550205 is 50205502.

It can be written as a sum of positive squares in 8 ways, for example, as 1653796 + 18896409 = 1286^2 + 4347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20550205 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550209) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 26199 + ... + 26971.

It is an arithmetic number, because the mean of its divisors is an integer number (1666035).

Almost surely, 2^20550205 is an apocalyptic number.

It is an amenable number.

20550205 is a deficient number, since it is larger than the sum of its proper divisors (6106355).

20550205 is a wasteful number, since it uses less digits than its factorization.

20550205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200.

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 20550205 is about 4533.2333935062. The cubic root of 20550205 is about 273.9084221636.

Adding to 20550205 its reverse (50205502), we get a palindrome (70755707).

The spelling of 20550205 in words is "twenty million, five hundred fifty thousand, two hundred five".