20389345 has 4 divisors (see below), whose sum is σ = 24467220. Its totient is φ = 16311472.

The previous prime is 20389319. The next prime is 20389357. The reversal of 20389345 is 54398302.

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 2 ways, for example, as 2614689 + 17774656 = 1617^2 + 4216^2 .

It is a cyclic number.

It is not a de Polignac number, because 20389345 - 2⁷ = 20389217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20389345.

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, 2038930 + ... + 2038939.

It is an arithmetic number, because the mean of its divisors is an integer number (6116805).

Almost surely, 2^20389345 is an apocalyptic number.

It is an amenable number.

20389345 is a deficient number, since it is larger than the sum of its proper divisors (4077875).

20389345 is an equidigital number, since it uses as much as digits as its factorization.

20389345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077874.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 20389345 is about 4515.4562338705. The cubic root of 20389345 is about 273.1918619808.

The spelling of 20389345 in words is "twenty million, three hundred eighty-nine thousand, three hundred forty-five".