20018008 has 8 divisors (see below), whose sum is σ = 37533780. Its totient is φ = 10009000.

The previous prime is 20017997. The next prime is 20018017. The reversal of 20018008 is 80081002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1251118 + ... + 1251133.

Almost surely, 2^20018008 is an apocalyptic number.

It is an amenable number.

20018008 is a deficient number, since it is larger than the sum of its proper divisors (17515772).

20018008 is a wasteful number, since it uses less digits than its factorization.

20018008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502257 (or 2502253 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 20018008 is about 4474.1488576041. The cubic root of 20018008 is about 271.5232059410.

The spelling of 20018008 in words is "twenty million, eighteen thousand, eight".