18016020 has 144 divisors (see below), whose sum is σ = 62008128. Its totient is φ = 4354560.

The previous prime is 18016007. The next prime is 18016021. The reversal of 18016020 is 2061081.

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 = 18015984 and 18016002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18016021) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 53292 + ... + 53628.

It is an arithmetic number, because the mean of its divisors is an integer number (430612).

Almost surely, 2^18016020 is an apocalyptic number.

18016020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18016020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31004064).

18016020 is an abundant number, since it is smaller than the sum of its proper divisors (43992108).

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

18016020 is a wasteful number, since it uses less digits than its factorization.

18016020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18016020 is about 4244.5282423374. The cubic root of 18016020 is about 262.1518650282.

The spelling of 18016020 in words is "eighteen million, sixteen thousand, twenty".