20018361 has 12 divisors (see below), whose sum is σ = 29338736. Its totient is φ = 12132120.

The previous prime is 20018357. The next prime is 20018377. The reversal of 20018361 is 16381002.

It is not a de Polignac number, because 20018361 - 2² = 20018357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20018351) 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 11 ways as a sum of consecutive naturals, for example, 27211 + ... + 27936.

Almost surely, 2^20018361 is an apocalyptic number.

It is an amenable number.

20018361 is a deficient number, since it is larger than the sum of its proper divisors (9320375).

20018361 is a wasteful number, since it uses less digits than its factorization.

20018361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55172 (or 55161 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20018361 is about 4474.1883062741. The cubic root of 20018361 is about 271.5248019561.

Adding to 20018361 its reverse (16381002), we get a palindrome (36399363).

The spelling of 20018361 in words is "twenty million, eighteen thousand, three hundred sixty-one".