20345345 has 8 divisors (see below), whose sum is σ = 25850664. Its totient is φ = 15318784.

The previous prime is 20345293. The next prime is 20345357. The reversal of 20345345 is 54354302.

It can be written as a sum of positive squares in 4 ways, for example, as 5607424 + 14737921 = 2368^2 + 3839^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20345345 - 2²⁰ = 19296769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119594 + ... + 119763.

It is an arithmetic number, because the mean of its divisors is an integer number (3231333).

Almost surely, 2^20345345 is an apocalyptic number.

It is an amenable number.

20345345 is a deficient number, since it is larger than the sum of its proper divisors (5505319).

20345345 is a wasteful number, since it uses less digits than its factorization.

20345345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239379.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 20345345 is about 4510.5814481062. The cubic root of 20345345 is about 272.9952053615.

Adding to 20345345 its reverse (54354302), we get a palindrome (74699647).

The spelling of 20345345 in words is "twenty million, three hundred forty-five thousand, three hundred forty-five".