20312221986 has 64 divisors (see below), whose sum is σ = 52239667200. Its totient is φ = 5730021648.

The previous prime is 20312221921. The next prime is 20312222027. The reversal of 20312221986 is 68912221302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20312221986.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310240 + ... + 369963.

It is an arithmetic number, because the mean of its divisors is an integer number (816244800).

Almost surely, 2^20312221986 is an apocalyptic number.

20312221986 is an abundant number, since it is smaller than the sum of its proper divisors (31927445214).

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

20312221986 is a wasteful number, since it uses less digits than its factorization.

20312221986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680300 (or 680294 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 20312221986 in words is "twenty billion, three hundred twelve million, two hundred twenty-one thousand, nine hundred eighty-six".