20381116 has 24 divisors (see below), whose sum is σ = 40912256. Its totient is φ = 8702640.

The previous prime is 20381107. The next prime is 20381149. The reversal of 20381116 is 61118302.

20381116 is nontrivially palindromic in base 15.

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 7 ways as a sum of consecutive naturals, for example, 7411 + ... + 9781.

Almost surely, 2^20381116 is an apocalyptic number.

It is an amenable number.

20381116 is an abundant number, since it is smaller than the sum of its proper divisors (20531140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20381116 is a wasteful number, since it uses less digits than its factorization.

20381116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689 (or 2687 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20381116 is about 4514.5449383077. The cubic root of 20381116 is about 273.1551042472.

Adding to 20381116 its reverse (61118302), we get a palindrome (81499418).

The spelling of 20381116 in words is "twenty million, three hundred eighty-one thousand, one hundred sixteen".