20210205 has 16 divisors (see below), whose sum is σ = 34038720. Its totient is φ = 10211328.

The previous prime is 20210189. The next prime is 20210237. The reversal of 20210205 is 50201202.

It is not a de Polignac number, because 20210205 - 2⁴ = 20210189 is a prime.

It is a super-2 number, since 2×20210205² = 816904772284050, which contains 22 as substring.

It is a Curzon number.

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, 35172 + ... + 35741.

It is an arithmetic number, because the mean of its divisors is an integer number (2127420).

Almost surely, 2^20210205 is an apocalyptic number.

It is an amenable number.

20210205 is a deficient number, since it is larger than the sum of its proper divisors (13828515).

20210205 is a wasteful number, since it uses less digits than its factorization.

20210205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70940.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20210205 is about 4495.5761588477. The cubic root of 20210205 is about 272.3894229130.

Adding to 20210205 its reverse (50201202), we get a palindrome (70411407).

The spelling of 20210205 in words is "twenty million, two hundred ten thousand, two hundred five".