20518886685202 has 8 divisors (see below), whose sum is σ = 30818353866300. Its totient is φ = 10246102063104.

The previous prime is 20518886685151. The next prime is 20518886685203. The reversal of 20518886685202 is 20258668881502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19261732214761 + 1257154470441 = 4388819^2 + 1121229^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20518886685203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6670637827 + ... + 6670640902.

Almost surely, 2^{20518886685202} is an apocalyptic number.

20518886685202 is a deficient number, since it is larger than the sum of its proper divisors (10299467181098).

20518886685202 is a wasteful number, since it uses less digits than its factorization.

20518886685202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13341279500.

The product of its (nonzero) digits is 29491200, while the sum is 61.

The spelling of 20518886685202 in words is "twenty trillion, five hundred eighteen billion, eight hundred eighty-six million, six hundred eighty-five thousand, two hundred two".