20345315 has 4 divisors (see below), whose sum is σ = 24414384. Its totient is φ = 16276248.

The previous prime is 20345293. The next prime is 20345357. The reversal of 20345315 is 51354302.

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

It is a cyclic number.

It is not a de Polignac number, because 20345315 - 2⁶ = 20345251 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2034527 + ... + 2034536.

It is an arithmetic number, because the mean of its divisors is an integer number (6103596).

Almost surely, 2^20345315 is an apocalyptic number.

20345315 is a deficient number, since it is larger than the sum of its proper divisors (4069069).

20345315 is an equidigital number, since it uses as much as digits as its factorization.

20345315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069068.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20345315 is about 4510.5781225914. The cubic root of 20345315 is about 272.9950711808.

Adding to 20345315 its reverse (51354302), we get a palindrome (71699617).

The spelling of 20345315 in words is "twenty million, three hundred forty-five thousand, three hundred fifteen".