18020226 has 32 divisors (see below), whose sum is σ = 41776128. Its totient is φ = 5075280.

The previous prime is 18020203. The next prime is 18020231. The reversal of 18020226 is 62202081.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40 + ... + 6003.

It is an arithmetic number, because the mean of its divisors is an integer number (1305504).

Almost surely, 2^18020226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18020226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20888064).

18020226 is an abundant number, since it is smaller than the sum of its proper divisors (23755902).

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

18020226 is a wasteful number, since it uses less digits than its factorization.

18020226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6126.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18020226 is about 4245.0236748456. The cubic root of 18020226 is about 262.1722640018.

The spelling of 18020226 in words is "eighteen million, twenty thousand, two hundred twenty-six".