20380385 has 4 divisors (see below), whose sum is σ = 24456468. Its totient is φ = 16304304.

The previous prime is 20380343. The next prime is 20380427. The reversal of 20380385 is 58308302.

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

It is an interprime number because it is at equal distance from previous prime (20380343) and next prime (20380427).

It can be written as a sum of positive squares in 2 ways, for example, as 15108769 + 5271616 = 3887^2 + 2296^2 .

It is a cyclic number.

It is not a de Polignac number, because 20380385 - 2¹⁰ = 20379361 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 3 ways as a sum of consecutive naturals, for example, 2038034 + ... + 2038043.

It is an arithmetic number, because the mean of its divisors is an integer number (6114117).

Almost surely, 2^20380385 is an apocalyptic number.

It is an amenable number.

20380385 is a deficient number, since it is larger than the sum of its proper divisors (4076083).

20380385 is an equidigital number, since it uses as much as digits as its factorization.

20380385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076082.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20380385 is about 4514.4639770409. The cubic root of 20380385 is about 273.1518384992.

Adding to 20380385 its reverse (58308302), we get a palindrome (78688687).

The spelling of 20380385 in words is "twenty million, three hundred eighty thousand, three hundred eighty-five".