20051218 has 8 divisors (see below), whose sum is σ = 32811120. Its totient is φ = 9114180.

The previous prime is 20051179. The next prime is 20051221. The reversal of 20051218 is 81215002.

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 = 20051195 and 20051204.

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, 455688 + ... + 455731.

It is an arithmetic number, because the mean of its divisors is an integer number (4101390).

Almost surely, 2^20051218 is an apocalyptic number.

20051218 is a deficient number, since it is larger than the sum of its proper divisors (12759902).

20051218 is a wasteful number, since it uses less digits than its factorization.

20051218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911432.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 20051218 is about 4477.8586400198. The cubic root of 20051218 is about 271.6732758794.

It can be divided in two parts, 2005 and 1218, that added together give a palindrome (3223).

The spelling of 20051218 in words is "twenty million, fifty-one thousand, two hundred eighteen".