20630205 has 12 divisors (see below), whose sum is σ = 35759100. Its totient is φ = 11002752.

The previous prime is 20630189. The next prime is 20630209. The reversal of 20630205 is 50203602.

It can be written as a sum of positive squares in 2 ways, for example, as 7518564 + 13111641 = 2742^2 + 3621^2 .

It is not a de Polignac number, because 20630205 - 2⁴ = 20630189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229180 + ... + 229269.

It is an arithmetic number, because the mean of its divisors is an integer number (2979925).

Almost surely, 2^20630205 is an apocalyptic number.

It is an amenable number.

20630205 is a deficient number, since it is larger than the sum of its proper divisors (15128895).

20630205 is a wasteful number, since it uses less digits than its factorization.

20630205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458460 (or 458457 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20630205 is about 4542.0485466362. The cubic root of 20630205 is about 274.2633951100.

Adding to 20630205 its reverse (50203602), we get a palindrome (70833807).

The spelling of 20630205 in words is "twenty million, six hundred thirty thousand, two hundred five".