18290220 has 96 divisors (see below), whose sum is σ = 55883520. Its totient is φ = 4442880.

The previous prime is 18290219. The next prime is 18290243. The reversal of 18290220 is 2209281.

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 31 ways as a sum of consecutive naturals, for example, 102091 + ... + 102269.

It is an arithmetic number, because the mean of its divisors is an integer number (582120).

Almost surely, 2^18290220 is an apocalyptic number.

18290220 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 18290220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27941760).

18290220 is an abundant number, since it is smaller than the sum of its proper divisors (37593300).

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

18290220 is a wasteful number, since it uses less digits than its factorization.

18290220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18290220 is about 4276.7066768718. The cubic root of 18290220 is about 263.4751394895.

The spelling of 18290220 in words is "eighteen million, two hundred ninety thousand, two hundred twenty".