20181818382 has 32 divisors (see below), whose sum is σ = 44349863040. Its totient is φ = 6071701920.

The previous prime is 20181818381. The next prime is 20181818407. The reversal of 20181818382 is 28381818102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181818381) 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 15 ways as a sum of consecutive naturals, for example, 1090773 + ... + 1109120.

It is an arithmetic number, because the mean of its divisors is an integer number (1385933220).

Almost surely, 2^20181818382 is an apocalyptic number.

20181818382 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20181818382 is an abundant number, since it is smaller than the sum of its proper divisors (24168044658).

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

20181818382 is a wasteful number, since it uses less digits than its factorization.

20181818382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200048.

The product of its (nonzero) digits is 49152, while the sum is 42.

The spelling of 20181818382 in words is "twenty billion, one hundred eighty-one million, eight hundred eighteen thousand, three hundred eighty-two".