20345211 has 12 divisors (see below), whose sum is σ = 30401280. Its totient is φ = 13095600.

The previous prime is 20345167. The next prime is 20345231. The reversal of 20345211 is 11254302.

20345211 is a `hidden beast` number, since 203 + 452 + 11 = 666.

It is not a de Polignac number, because 20345211 - 2¹⁰ = 20344187 is a prime.

It is a super-3 number, since 3×20345211³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (20345231) 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, 38715 + ... + 39236.

It is an arithmetic number, because the mean of its divisors is an integer number (2533440).

Almost surely, 2^20345211 is an apocalyptic number.

20345211 is a deficient number, since it is larger than the sum of its proper divisors (10056069).

20345211 is a wasteful number, since it uses less digits than its factorization.

20345211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77986 (or 77983 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20345211 is about 4510.5665941210. The cubic root of 20345211 is about 272.9946060199.

Adding to 20345211 its reverse (11254302), we get a palindrome (31599513).

Subtracting from 20345211 its reverse (11254302), we obtain a palindrome (9090909).

The spelling of 20345211 in words is "twenty million, three hundred forty-five thousand, two hundred eleven".