20017206 has 80 divisors (see below), whose sum is σ = 50181120. Its totient is φ = 5911920.

The previous prime is 20017189. The next prime is 20017223. The reversal of 20017206 is 60271002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20017189) and next prime (20017223).

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83635 + ... + 83873.

It is an arithmetic number, because the mean of its divisors is an integer number (627264).

Almost surely, 2^20017206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20017206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25090560).

20017206 is an abundant number, since it is smaller than the sum of its proper divisors (30163914).

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

20017206 is a wasteful number, since it uses less digits than its factorization.

20017206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20017206 is about 4474.0592307210. The cubic root of 20017206 is about 271.5195797973.

Adding to 20017206 its reverse (60271002), we get a palindrome (80288208).

The spelling of 20017206 in words is "twenty million, seventeen thousand, two hundred six".