20445385 has 8 divisors (see below), whose sum is σ = 24901056. Its totient is φ = 16111920.

The previous prime is 20445361. The next prime is 20445427. The reversal of 20445385 is 58354402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20445385 - 2⁵ = 20445353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30181 + ... + 30850.

It is an arithmetic number, because the mean of its divisors is an integer number (3112632).

Almost surely, 2^20445385 is an apocalyptic number.

It is an amenable number.

20445385 is a deficient number, since it is larger than the sum of its proper divisors (4455671).

20445385 is an equidigital number, since it uses as much as digits as its factorization.

20445385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61103.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 20445385 is about 4521.6573289005. The cubic root of 20445385 is about 273.4419217897.

Adding to 20445385 its reverse (58354402), we get a palindrome (78799787).

The spelling of 20445385 in words is "twenty million, four hundred forty-five thousand, three hundred eighty-five".