18220003 has 8 divisors (see below), whose sum is σ = 18754736. Its totient is φ = 17690400.

The previous prime is 18219989. The next prime is 18220049. The reversal of 18220003 is 30002281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18220003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18220093) 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 7 ways as a sum of consecutive naturals, for example, 6613 + ... + 8953.

It is an arithmetic number, because the mean of its divisors is an integer number (2344342).

Almost surely, 2^18220003 is an apocalyptic number.

18220003 is a deficient number, since it is larger than the sum of its proper divisors (534733).

18220003 is a wasteful number, since it uses less digits than its factorization.

18220003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 18220003 is about 4268.4895454950. The cubic root of 18220003 is about 263.1375426906.

Adding to 18220003 its reverse (30002281), we get a palindrome (48222284).

The spelling of 18220003 in words is "eighteen million, two hundred twenty thousand, three".