20611206 has 64 divisors (see below), whose sum is σ = 57116160. Its totient is φ = 5352480.

The previous prime is 20611193. The next prime is 20611231. The reversal of 20611206 is 60211602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1680 + ... + 6636.

It is an arithmetic number, because the mean of its divisors is an integer number (892440).

Almost surely, 2^20611206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20611206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28558080).

20611206 is an abundant number, since it is smaller than the sum of its proper divisors (36504954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20611206 is a wasteful number, since it uses less digits than its factorization.

20611206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4986 (or 4980 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20611206 is about 4539.9566077221. The cubic root of 20611206 is about 274.1791766766.

Adding to 20611206 its reverse (60211602), we get a palindrome (80822808).

The spelling of 20611206 in words is "twenty million, six hundred eleven thousand, two hundred six".