20051218218 has 8 divisors (see below), whose sum is σ = 40102436448. Its totient is φ = 6683739404.

The previous prime is 20051218199. The next prime is 20051218237. The reversal of 20051218218 is 81281215002.

It is an interprime number because it is at equal distance from previous prime (20051218199) and next prime (20051218237).

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

20051218218 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1670934846 + ... + 1670934857.

It is an arithmetic number, because the mean of its divisors is an integer number (5012804556).

Almost surely, 2^20051218218 is an apocalyptic number.

20051218218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20051218218 is a wasteful number, since it uses less digits than its factorization.

20051218218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341869708.

The product of its (nonzero) digits is 2560, while the sum is 30.

The spelling of 20051218218 in words is "twenty billion, fifty-one million, two hundred eighteen thousand, two hundred eighteen".