20385255 has 16 divisors (see below), whose sum is σ = 35581824. Its totient is φ = 9883680.

The previous prime is 20385251. The next prime is 20385257. The reversal of 20385255 is 55258302.

It is not a de Polignac number, because 20385255 - 2² = 20385251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20385251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61609 + ... + 61938.

It is an arithmetic number, because the mean of its divisors is an integer number (2223864).

Almost surely, 2^20385255 is an apocalyptic number.

20385255 is a deficient number, since it is larger than the sum of its proper divisors (15196569).

20385255 is a wasteful number, since it uses less digits than its factorization.

20385255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123566.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 20385255 is about 4515.0033222579. The cubic root of 20385255 is about 273.1735937884.

Subtracting from 20385255 its sum of digits (30), we obtain a square (20385225 = 4515²).

It can be divided in two parts, 203 and 85255, that added together give a palindrome (85458).

The spelling of 20385255 in words is "twenty million, three hundred eighty-five thousand, two hundred fifty-five".