18020286 has 32 divisors (see below), whose sum is σ = 40212480. Its totient is φ = 5981688.

The previous prime is 18020267. The next prime is 18020309. The reversal of 18020286 is 68202081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 16035 + ... + 17121.

It is an arithmetic number, because the mean of its divisors is an integer number (1256640).

Almost surely, 2^18020286 is an apocalyptic number.

18020286 is an abundant number, since it is smaller than the sum of its proper divisors (22192194).

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

18020286 is a wasteful number, since it uses less digits than its factorization.

18020286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405 (or 1399 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18020286 is about 4245.0307419382. The cubic root of 18020286 is about 262.1725549771.

The spelling of 18020286 in words is "eighteen million, twenty thousand, two hundred eighty-six".