20208346 has 4 divisors (see below), whose sum is σ = 30312522. Its totient is φ = 10104172.

The previous prime is 20208319. The next prime is 20208347. The reversal of 20208346 is 64380202.

It is a happy number.

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., 10530025 + 9678321 = 3245^2 + 3111^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20208346.

It is not an unprimeable number, because it can be changed into a prime (20208347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5052085 + ... + 5052088.

Almost surely, 2^20208346 is an apocalyptic number.

20208346 is a deficient number, since it is larger than the sum of its proper divisors (10104176).

20208346 is a wasteful number, since it uses less digits than its factorization.

20208346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10104175.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20208346 is about 4495.3693952778. The cubic root of 20208346 is about 272.3810709036.

Adding to 20208346 its reverse (64380202), we get a palindrome (84588548).

The spelling of 20208346 in words is "twenty million, two hundred eight thousand, three hundred forty-six".