20018138 has 8 divisors (see below), whose sum is σ = 34316832. Its totient is φ = 8579196.

The previous prime is 20018113. The next prime is 20018161. The reversal of 20018138 is 83181002.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714920 + ... + 714947.

It is an arithmetic number, because the mean of its divisors is an integer number (4289604).

Almost surely, 2^20018138 is an apocalyptic number.

20018138 is a deficient number, since it is larger than the sum of its proper divisors (14298694).

20018138 is a wasteful number, since it uses less digits than its factorization.

20018138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429876.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 20018138 is about 4474.1633854834. The cubic root of 20018138 is about 271.5237937107.

The spelling of 20018138 in words is "twenty million, eighteen thousand, one hundred thirty-eight".