20303205 has 16 divisors (see below), whose sum is σ = 34984320. Its totient is φ = 9995328.

The previous prime is 20303203. The next prime is 20303249. The reversal of 20303205 is 50230302.

It is not a de Polignac number, because 20303205 - 2¹ = 20303203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51865 + ... + 52254.

It is an arithmetic number, because the mean of its divisors is an integer number (2186520).

Almost surely, 2^20303205 is an apocalyptic number.

It is an amenable number.

20303205 is a deficient number, since it is larger than the sum of its proper divisors (14681115).

20303205 is a wasteful number, since it uses less digits than its factorization.

20303205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104140.

The product of its (nonzero) digits is 180, while the sum is 15.

The square root of 20303205 is about 4505.9077886703. The cubic root of 20303205 is about 272.8065959669.

Adding to 20303205 its reverse (50230302), we get a palindrome (70533507).

The spelling of 20303205 in words is "twenty million, three hundred three thousand, two hundred five".