20203306 has 4 divisors (see below), whose sum is σ = 30304962. Its totient is φ = 10101652.

The previous prime is 20203303. The next prime is 20203307. The reversal of 20203306 is 60330202.

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

It can be written as a sum of positive squares in only one way, i.e., 20169081 + 34225 = 4491^2 + 185^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20203306.

It is not an unprimeable number, because it can be changed into a prime (20203301) by changing a digit.

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 as a sum of consecutive naturals, namely, 5050825 + ... + 5050828.

Almost surely, 2^20203306 is an apocalyptic number.

20203306 is a deficient number, since it is larger than the sum of its proper divisors (10101656).

20203306 is a wasteful number, since it uses less digits than its factorization.

20203306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10101655.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 20203306 is about 4494.8087834746. The cubic root of 20203306 is about 272.3584249015.

Adding to 20203306 its reverse (60330202), we get a palindrome (80533508).

The spelling of 20203306 in words is "twenty million, two hundred three thousand, three hundred six".