20811813214512 has 40 divisors (see below), whose sum is σ = 56926430265456. Its totient is φ = 6529196302336.

The previous prime is 20811813214459. The next prime is 20811813214559. The reversal of 20811813214512 is 21541231811802.

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 7 ways as a sum of consecutive naturals, for example, 12752335713 + ... + 12752337344.

Almost surely, 2^{20811813214512} is an apocalyptic number.

It is an amenable number.

20811813214512 is an abundant number, since it is smaller than the sum of its proper divisors (36114617050944).

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

20811813214512 is a wasteful number, since it uses less digits than its factorization.

20811813214512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25504673085 (or 25504673079 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 39.

The spelling of 20811813214512 in words is "twenty trillion, eight hundred eleven billion, eight hundred thirteen million, two hundred fourteen thousand, five hundred twelve".