20389315 has 4 divisors (see below), whose sum is σ = 24467184. Its totient is φ = 16311448.

The previous prime is 20389297. The next prime is 20389319. The reversal of 20389315 is 51398302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51398302 = 2 ⋅25699151.

It is a cyclic number.

It is not a de Polignac number, because 20389315 - 2⁹ = 20388803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20389319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2038927 + ... + 2038936.

It is an arithmetic number, because the mean of its divisors is an integer number (6116796).

Almost surely, 2^20389315 is an apocalyptic number.

20389315 is a deficient number, since it is larger than the sum of its proper divisors (4077869).

20389315 is an equidigital number, since it uses as much as digits as its factorization.

20389315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077868.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 20389315 is about 4515.4529119458. The cubic root of 20389315 is about 273.1917279932.

The spelling of 20389315 in words is "twenty million, three hundred eighty-nine thousand, three hundred fifteen".