20018018 has 8 divisors (see below), whose sum is σ = 30049500. Its totient is φ = 10001520.

The previous prime is 20018017. The next prime is 20018021. The reversal of 20018018 is 81081002.

It can be written as a sum of positive squares in 2 ways, for example, as 11648569 + 8369449 = 3413^2 + 2893^2 .

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

20018018 is a modest number, since divided by 18018 gives 20 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20018017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608 + ... + 6356.

Almost surely, 2^20018018 is an apocalyptic number.

20018018 is a deficient number, since it is larger than the sum of its proper divisors (10031482).

20018018 is a wasteful number, since it uses less digits than its factorization.

20018018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7492.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 20018018 is about 4474.1499751349. The cubic root of 20018018 is about 271.5232511541.

The spelling of 20018018 in words is "twenty million, eighteen thousand, eighteen".