18720201 has 8 divisors (see below), whose sum is σ = 24984640. Its totient is φ = 12467952.

The previous prime is 18720197. The next prime is 18720203. The reversal of 18720201 is 10202781.

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

It is not a de Polignac number, because 18720201 - 2² = 18720197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18720203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515 + ... + 6303.

It is an arithmetic number, because the mean of its divisors is an integer number (3123080).

Almost surely, 2^18720201 is an apocalyptic number.

It is an amenable number.

18720201 is a deficient number, since it is larger than the sum of its proper divisors (6264439).

18720201 is a wasteful number, since it uses less digits than its factorization.

18720201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6095.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 18720201 is about 4326.6847585652. The cubic root of 18720201 is about 265.5238291712.

Adding to 18720201 its reverse (10202781), we get a palindrome (28922982).

The spelling of 18720201 in words is "eighteen million, seven hundred twenty thousand, two hundred one".