18420282 has 36 divisors (see below), whose sum is σ = 42408366. Its totient is φ = 5777280.

The previous prime is 18420271. The next prime is 18420289. The reversal of 18420282 is 28202481.

It can be written as a sum of positive squares in 3 ways, for example, as 18071001 + 349281 = 4251^2 + 591^2 .

It is not an unprimeable number, because it can be changed into a prime (18420289) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3432 + ... + 6972.

Almost surely, 2^18420282 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18420282, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21204183).

18420282 is an abundant number, since it is smaller than the sum of its proper divisors (23988084).

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

18420282 is a wasteful number, since it uses less digits than its factorization.

18420282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583 (or 3563 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 18420282 is about 4291.8855995937. The cubic root of 18420282 is about 264.0981900595.

The spelling of 18420282 in words is "eighteen million, four hundred twenty thousand, two hundred eighty-two".