20208345 has 8 divisors (see below), whose sum is σ = 32333376. Its totient is φ = 10777776.

The previous prime is 20208319. The next prime is 20208347. The reversal of 20208345 is 54380202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20208345 - 2⁵ = 20208313 is a prime.

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 in 7 ways as a sum of consecutive naturals, for example, 673597 + ... + 673626.

It is an arithmetic number, because the mean of its divisors is an integer number (4041672).

Almost surely, 2^20208345 is an apocalyptic number.

It is an amenable number.

20208345 is a deficient number, since it is larger than the sum of its proper divisors (12125031).

20208345 is a wasteful number, since it uses less digits than its factorization.

20208345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347231.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20208345 is about 4495.3692840522. The cubic root of 20208345 is about 272.3810664107.

Adding to 20208345 its reverse (54380202), we get a palindrome (74588547).

The spelling of 20208345 in words is "twenty million, two hundred eight thousand, three hundred forty-five".