20420206 has 4 divisors (see below), whose sum is σ = 30630312. Its totient is φ = 10210102.

The previous prime is 20420167. The next prime is 20420207. The reversal of 20420206 is 60202402.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20420206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105050 + ... + 5105053.

It is an arithmetic number, because the mean of its divisors is an integer number (7657578).

Almost surely, 2^20420206 is an apocalyptic number.

20420206 is a deficient number, since it is larger than the sum of its proper divisors (10210106).

20420206 is a wasteful number, since it uses less digits than its factorization.

20420206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210105.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20420206 is about 4518.8722044333. The cubic root of 20420206 is about 273.3296255033.

Adding to 20420206 its reverse (60202402), we get a palindrome (80622608).

The spelling of 20420206 in words is "twenty million, four hundred twenty thousand, two hundred six".