20118216852 has 18 divisors (see below), whose sum is σ = 50854381578. Its totient is φ = 6706072272.

The previous prime is 20118216851. The next prime is 20118216869. The reversal of 20118216852 is 25861281102.

It can be written as a sum of positive squares in only one way, i.e., 19166741136 + 951475716 = 138444^2 + 30846^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×20118216852³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 558839357 = 20118216852 / (2 + 0 + 1 + 1 + 8 + 2 + 1 + 6 + 8 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20118216851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279419643 + ... + 279419714.

It is an arithmetic number, because the mean of its divisors is an integer number (2825243421).

Almost surely, 2^20118216852 is an apocalyptic number.

It is an amenable number.

20118216852 is an abundant number, since it is smaller than the sum of its proper divisors (30736164726).

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

20118216852 is a wasteful number, since it uses less digits than its factorization.

20118216852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558839367 (or 558839362 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

Adding to 20118216852 its reverse (25861281102), we get a palindrome (45979497954).

The spelling of 20118216852 in words is "twenty billion, one hundred eighteen million, two hundred sixteen thousand, eight hundred fifty-two".