20018139 has 8 divisors (see below), whose sum is σ = 26717712. Its totient is φ = 13332000.

The previous prime is 20018113. The next prime is 20018161. The reversal of 20018139 is 93181002.

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

It is not a de Polignac number, because 20018139 - 2¹³ = 20009947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20018239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 889 + ... + 6389.

It is an arithmetic number, because the mean of its divisors is an integer number (3339714).

Almost surely, 2^20018139 is an apocalyptic number.

20018139 is a deficient number, since it is larger than the sum of its proper divisors (6699573).

20018139 is a wasteful number, since it uses less digits than its factorization.

20018139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6717.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 20018139 is about 4474.1634972361. The cubic root of 20018139 is about 271.5237982320.

The spelling of 20018139 in words is "twenty million, eighteen thousand, one hundred thirty-nine".