18020000 has 120 divisors (see below), whose sum is σ = 47825316. Its totient is φ = 6656000.

The previous prime is 18019993. The next prime is 18020011. The reversal of 18020000 is 2081.

It can be written as a sum of positive squares in 10 ways, for example, as 8464 + 18011536 = 92^2 + 4244^2 .

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 19 ways as a sum of consecutive naturals, for example, 339974 + ... + 340026.

Almost surely, 2^18020000 is an apocalyptic number.

18020000 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 18020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23912658).

18020000 is an abundant number, since it is smaller than the sum of its proper divisors (29805316).

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

18020000 is an equidigital number, since it uses as much as digits as its factorization.

18020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 18020000 is about 4244.9970553582. The cubic root of 18020000 is about 262.1711679893.

Adding to 18020000 its reverse (2081), we get a palindrome (18022081).

The spelling of 18020000 in words is "eighteen million, twenty thousand".