20385563 has 8 divisors (see below), whose sum is σ = 22284720. Its totient is φ = 18494080.

The previous prime is 20385559. The next prime is 20385571. The reversal of 20385563 is 36558302.

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

It is not a de Polignac number, because 20385563 - 2² = 20385559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20385583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4631 + ... + 7887.

It is an arithmetic number, because the mean of its divisors is an integer number (2785590).

Almost surely, 2^20385563 is an apocalyptic number.

20385563 is a deficient number, since it is larger than the sum of its proper divisors (1899157).

20385563 is a wasteful number, since it uses less digits than its factorization.

20385563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3837.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 20385563 is about 4515.0374306311. The cubic root of 20385563 is about 273.1749695711.

It can be divided in two parts, 20 and 385563, that added together give a palindrome (385583).

The spelling of 20385563 in words is "twenty million, three hundred eighty-five thousand, five hundred sixty-three".