20381418 has 12 divisors (see below), whose sum is σ = 44159778. Its totient is φ = 6793800.

The previous prime is 20381411. The next prime is 20381443. The reversal of 20381418 is 81418302.

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 1432809 = 4353^2 + 1197^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20381391 and 20381400.

It is not an unprimeable number, because it can be changed into a prime (20381411) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 566133 + ... + 566168.

Almost surely, 2^20381418 is an apocalyptic number.

20381418 is an abundant number, since it is smaller than the sum of its proper divisors (23778360).

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

20381418 is a wasteful number, since it uses less digits than its factorization.

20381418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132309 (or 1132306 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20381418 is about 4514.5783856303. The cubic root of 20381418 is about 273.1564534117.

The spelling of 20381418 in words is "twenty million, three hundred eighty-one thousand, four hundred eighteen".