20512216218 has 32 divisors (see below), whose sum is σ = 46778993856. Its totient is φ = 5940188928.

The previous prime is 20512216217. The next prime is 20512216223. The reversal of 20512216218 is 81261221502.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20512216217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7733296 + ... + 7735947.

It is an arithmetic number, because the mean of its divisors is an integer number (1461843558).

Almost surely, 2^20512216218 is an apocalyptic number.

20512216218 is an abundant number, since it is smaller than the sum of its proper divisors (26266777638).

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

20512216218 is a wasteful number, since it uses less digits than its factorization.

20512216218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15469278.

The product of its (nonzero) digits is 3840, while the sum is 30.

The spelling of 20512216218 in words is "twenty billion, five hundred twelve million, two hundred sixteen thousand, two hundred eighteen".