20117621520236 has 72 divisors (see below), whose sum is σ = 36893263518720. Its totient is φ = 9597912511264.

The previous prime is 20117621520233. The next prime is 20117621520323. The reversal of 20117621520236 is 63202512671102.

It is a self number, because there is not a number n which added to its sum of digits gives 20117621520236.

It is not an unprimeable number, because it can be changed into a prime (20117621520233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4277612261 + ... + 4277616963.

It is an arithmetic number, because the mean of its divisors is an integer number (512406437760).

Almost surely, 2^{20117621520236} is an apocalyptic number.

It is an amenable number.

20117621520236 is a deficient number, since it is larger than the sum of its proper divisors (16775641998484).

20117621520236 is a wasteful number, since it uses less digits than its factorization.

20117621520236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9275 (or 9250 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 20117621520236 in words is "twenty trillion, one hundred seventeen billion, six hundred twenty-one million, five hundred twenty thousand, two hundred thirty-six".