20181382 has 16 divisors (see below), whose sum is σ = 34317360. Its totient is φ = 8824032.

The previous prime is 20181353. The next prime is 20181437. The reversal of 20181382 is 28318102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19933 + ... + 20920.

It is an arithmetic number, because the mean of its divisors is an integer number (2144835).

Almost surely, 2^20181382 is an apocalyptic number.

20181382 is a deficient number, since it is larger than the sum of its proper divisors (14135978).

20181382 is a wasteful number, since it uses less digits than its factorization.

20181382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40887.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20181382 is about 4492.3693080601. The cubic root of 20181382 is about 272.2598709433.

Adding to 20181382 its reverse (28318102), we get a palindrome (48499484).

The spelling of 20181382 in words is "twenty million, one hundred eighty-one thousand, three hundred eighty-two".