20443205 has 24 divisors (see below), whose sum is σ = 26278560. Its totient is φ = 15260960.

The previous prime is 20443201. The next prime is 20443249. The reversal of 20443205 is 50234402.

20443205 = 41² + 42² + ... + 394².

It is not a de Polignac number, because 20443205 - 2² = 20443201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443201) 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 23 ways as a sum of consecutive naturals, for example, 155990 + ... + 156120.

It is an arithmetic number, because the mean of its divisors is an integer number (1094940).

Almost surely, 2^20443205 is an apocalyptic number.

It is an amenable number.

20443205 is a deficient number, since it is larger than the sum of its proper divisors (5835355).

20443205 is a wasteful number, since it uses less digits than its factorization.

20443205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20443205 is about 4521.4162604211. The cubic root of 20443205 is about 273.4322028144.

Adding to 20443205 its reverse (50234402), we get a palindrome (70677607).

The spelling of 20443205 in words is "twenty million, four hundred forty-three thousand, two hundred five".