20684618312 has 32 divisors (see below), whose sum is σ = 40045605120. Its totient is φ = 10005971520.

The previous prime is 20684618303. The next prime is 20684618323. The reversal of 20684618312 is 21381648602.

It is a self number, because there is not a number n which added to its sum of digits gives 20684618312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1140983 + ... + 1158969.

It is an arithmetic number, because the mean of its divisors is an integer number (1251425160).

Almost surely, 2^20684618312 is an apocalyptic number.

It is an amenable number.

20684618312 is a deficient number, since it is larger than the sum of its proper divisors (19360986808).

20684618312 is a wasteful number, since it uses less digits than its factorization.

20684618312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22661 (or 22657 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 20684618312 in words is "twenty billion, six hundred eighty-four million, six hundred eighteen thousand, three hundred twelve".