20384145 has 24 divisors (see below), whose sum is σ = 35448192. Its totient is φ = 10836000.

The previous prime is 20384113. The next prime is 20384149. The reversal of 20384145 is 54148302.

It is not a de Polignac number, because 20384145 - 2⁵ = 20384113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20384149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18870 + ... + 19920.

It is an arithmetic number, because the mean of its divisors is an integer number (1477008).

Almost surely, 2^20384145 is an apocalyptic number.

It is an amenable number.

20384145 is a deficient number, since it is larger than the sum of its proper divisors (15064047).

20384145 is a wasteful number, since it uses less digits than its factorization.

20384145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20384145 is about 4514.8803970869. The cubic root of 20384145 is about 273.1686354955.

It can be divided in two parts, 203 and 84145, that added together give a palindrome (84348).

The spelling of 20384145 in words is "twenty million, three hundred eighty-four thousand, one hundred forty-five".