20203205 has 16 divisors (see below), whose sum is σ = 26702784. Its totient is φ = 14551680.

The previous prime is 20203187. The next prime is 20203217. The reversal of 20203205 is 50230202.

It is a de Polignac number, because none of the positive numbers 2^k-20203205 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20203205.

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 15 ways as a sum of consecutive naturals, for example, 4169 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (1668924).

Almost surely, 2^20203205 is an apocalyptic number.

It is an amenable number.

20203205 is a deficient number, since it is larger than the sum of its proper divisors (6499579).

20203205 is a wasteful number, since it uses less digits than its factorization.

20203205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20203205 is about 4494.7975482773. The cubic root of 20203205 is about 272.3579710443.

Adding to 20203205 its reverse (50230202), we get a palindrome (70433407).

It can be divided in two parts, 2020 and 3205, that added together give a palindrome (5225).

The spelling of 20203205 in words is "twenty million, two hundred three thousand, two hundred five".