20018868 has 24 divisors (see below), whose sum is σ = 46985568. Its totient is φ = 6633696.

The previous prime is 20018849. The next prime is 20018881. The reversal of 20018868 is 86881002.

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 7 ways as a sum of consecutive naturals, for example, 2746 + ... + 6897.

It is an arithmetic number, because the mean of its divisors is an integer number (1957732).

Almost surely, 2^20018868 is an apocalyptic number.

It is an amenable number.

20018868 is an abundant number, since it is smaller than the sum of its proper divisors (26966700).

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

20018868 is a wasteful number, since it uses less digits than its factorization.

20018868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9823 (or 9821 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 20018868 is about 4474.2449642370. The cubic root of 20018868 is about 271.5270942169.

The spelling of 20018868 in words is "twenty million, eighteen thousand, eight hundred sixty-eight".