20814385 has 4 divisors (see below), whose sum is σ = 24977268. Its totient is φ = 16651504.

The previous prime is 20814377. The next prime is 20814397. The reversal of 20814385 is 58341802.

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 7969329 + 12845056 = 2823^2 + 3584^2 .

It is a cyclic number.

It is not a de Polignac number, because 20814385 - 2³ = 20814377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081434 + ... + 2081443.

It is an arithmetic number, because the mean of its divisors is an integer number (6244317).

Almost surely, 2^20814385 is an apocalyptic number.

It is an amenable number.

20814385 is a deficient number, since it is larger than the sum of its proper divisors (4162883).

20814385 is an equidigital number, since it uses as much as digits as its factorization.

20814385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162882.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20814385 is about 4562.2784877734. The cubic root of 20814385 is about 275.0771574131.

The spelling of 20814385 in words is "twenty million, eight hundred fourteen thousand, three hundred eighty-five".