18220282 has 4 divisors (see below), whose sum is σ = 27330426. Its totient is φ = 9110140.

The previous prime is 18220271. The next prime is 18220283. The reversal of 18220282 is 28202281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16801801 + 1418481 = 4099^2 + 1191^2 .

It is not an unprimeable number, because it can be changed into a prime (18220283) by changing a digit.

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 as a sum of consecutive naturals, namely, 4555069 + ... + 4555072.

Almost surely, 2^18220282 is an apocalyptic number.

18220282 is a deficient number, since it is larger than the sum of its proper divisors (9110144).

18220282 is an equidigital number, since it uses as much as digits as its factorization.

18220282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9110143.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 18220282 is about 4268.5222267197. The cubic root of 18220282 is about 263.1388858115.

The spelling of 18220282 in words is "eighteen million, two hundred twenty thousand, two hundred eighty-two".