20018518 has 8 divisors (see below), whose sum is σ = 32337648. Its totient is φ = 9239304.

The previous prime is 20018491. The next prime is 20018527. The reversal of 20018518 is 81581002.

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

It is a junction number, because it is equal to n+sod(n) for n = 20018492 and 20018501.

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 3 ways as a sum of consecutive naturals, for example, 384946 + ... + 384997.

It is an arithmetic number, because the mean of its divisors is an integer number (4042206).

Almost surely, 2^20018518 is an apocalyptic number.

20018518 is a deficient number, since it is larger than the sum of its proper divisors (12319130).

20018518 is a wasteful number, since it uses less digits than its factorization.

20018518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769958.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 20018518 is about 4474.2058513216. The cubic root of 20018518 is about 271.5255117924.

The spelling of 20018518 in words is "twenty million, eighteen thousand, five hundred eighteen".