20018364 has 12 divisors (see below), whose sum is σ = 46709544. Its totient is φ = 6672784.

The previous prime is 20018357. The next prime is 20018377. The reversal of 20018364 is 46381002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 834087 + ... + 834110.

It is an arithmetic number, because the mean of its divisors is an integer number (3892462).

Almost surely, 2^20018364 is an apocalyptic number.

It is an amenable number.

20018364 is an abundant number, since it is smaller than the sum of its proper divisors (26691180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20018364 is a wasteful number, since it uses less digits than its factorization.

20018364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668204 (or 1668202 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20018364 is about 4474.1886415304. The cubic root of 20018364 is about 271.5248155198.

Adding to 20018364 its reverse (46381002), we get a palindrome (66399366).

The spelling of 20018364 in words is "twenty million, eighteen thousand, three hundred sixty-four".