18020016 has 160 divisors (see below), whose sum is σ = 60710400. Its totient is φ = 5011200.

The previous prime is 18020011. The next prime is 18020027. The reversal of 18020016 is 61002081.

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

It is not an unprimeable number, because it can be changed into a prime (18020011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178366 + ... + 178466.

It is an arithmetic number, because the mean of its divisors is an integer number (379440).

Almost surely, 2^18020016 is an apocalyptic number.

18020016 is a gapful number since it is divisible by the number (16) 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 18020016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30355200).

18020016 is an abundant number, since it is smaller than the sum of its proper divisors (42690384).

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

18020016 is a wasteful number, since it uses less digits than its factorization.

18020016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 172 counting only the distinct ones).

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

The square root of 18020016 is about 4244.9989399292. The cubic root of 18020016 is about 262.1712455834.

Adding to 18020016 its reverse (61002081), we get a palindrome (79022097).

The spelling of 18020016 in words is "eighteen million, twenty thousand, sixteen".