18220269 has 4 divisors (see below), whose sum is σ = 24293696. Its totient is φ = 12146844.

The previous prime is 18220247. The next prime is 18220271. The reversal of 18220269 is 96202281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18220269 - 2²¹ = 16123117 is a prime.

It is a super-2 number, since 2×18220269² = 663956404864722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220469) 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 in 3 ways as a sum of consecutive naturals, for example, 3036709 + ... + 3036714.

It is an arithmetic number, because the mean of its divisors is an integer number (6073424).

Almost surely, 2^18220269 is an apocalyptic number.

It is an amenable number.

18220269 is a deficient number, since it is larger than the sum of its proper divisors (6073427).

18220269 is an equidigital number, since it uses as much as digits as its factorization.

18220269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6073426.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18220269 is about 4268.5207039442. The cubic root of 18220269 is about 263.1388232291.

The spelling of 18220269 in words is "eighteen million, two hundred twenty thousand, two hundred sixty-nine".