20138361808610 has 8 divisors (see below), whose sum is σ = 36249051255516. Its totient is φ = 8055344723440.

The previous prime is 20138361808519. The next prime is 20138361808687. The reversal of 20138361808610 is 1680816383102.

It can be written as a sum of positive squares in 2 ways, for example, as 19338859374409 + 799502434201 = 4397597^2 + 894149^2 .

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

It is an unprimeable number.

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, 1006918090421 + ... + 1006918090440.

Almost surely, 2^{20138361808610} is an apocalyptic number.

20138361808610 is a deficient number, since it is larger than the sum of its proper divisors (16110689446906).

20138361808610 is a wasteful number, since it uses less digits than its factorization.

20138361808610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013836180868.

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 20138361808610 in words is "twenty trillion, one hundred thirty-eight billion, three hundred sixty-one million, eight hundred eight thousand, six hundred ten".