18322020 has 36 divisors (see below), whose sum is σ = 55577340. Its totient is φ = 4885824.

The previous prime is 18322019. The next prime is 18322033. The reversal of 18322020 is 2022381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7193124 + 11128896 = 2682^2 + 3336^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18321984 and 18322002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50715 + ... + 51074.

It is an arithmetic number, because the mean of its divisors is an integer number (1543815).

Almost surely, 2^18322020 is an apocalyptic number.

18322020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18322020 is an abundant number, since it is smaller than the sum of its proper divisors (37255320).

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

18322020 is a wasteful number, since it uses less digits than its factorization.

18322020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101804 (or 101799 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 18322020 is about 4280.4228763056. The cubic root of 18322020 is about 263.6277467007.

The spelling of 18322020 in words is "eighteen million, three hundred twenty-two thousand, twenty".