20381015 has 16 divisors (see below), whose sum is σ = 26173920. Its totient is φ = 15189120.

The previous prime is 20380963. The next prime is 20381027. The reversal of 20381015 is 51018302.

It is not a de Polignac number, because 20381015 - 2⁶ = 20380951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4037 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (1635870).

Almost surely, 2^20381015 is an apocalyptic number.

20381015 is a deficient number, since it is larger than the sum of its proper divisors (5792905).

20381015 is a wasteful number, since it uses less digits than its factorization.

20381015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3602.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 20381015 is about 4514.5337522274. The cubic root of 20381015 is about 273.1546530336.

Adding to 20381015 its reverse (51018302), we get a palindrome (71399317).

It can be divided in two parts, 203 and 81015, that added together give a palindrome (81218).

The spelling of 20381015 in words is "twenty million, three hundred eighty-one thousand, fifteen".