18220699 has 6 divisors (see below), whose sum is σ = 21195564. Its totient is φ = 15617700.

The previous prime is 18220693. The next prime is 18220733. The reversal of 18220699 is 99602281.

It is not a de Polignac number, because 18220699 - 2⁵ = 18220667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18220693) 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 5 ways as a sum of consecutive naturals, for example, 185877 + ... + 185974.

It is an arithmetic number, because the mean of its divisors is an integer number (3532594).

Almost surely, 2^18220699 is an apocalyptic number.

18220699 is a deficient number, since it is larger than the sum of its proper divisors (2974865).

18220699 is an equidigital number, since it uses as much as digits as its factorization.

18220699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371865 (or 371858 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 18220699 is about 4268.5710723848. The cubic root of 18220699 is about 263.1408932462.

The spelling of 18220699 in words is "eighteen million, two hundred twenty thousand, six hundred ninety-nine".