20186666852 has 24 divisors (see below), whose sum is σ = 38545022880. Its totient is φ = 9174128960.

The previous prime is 20186666761. The next prime is 20186666909. The reversal of 20186666852 is 25866668102.

It is a self number, because there is not a number n which added to its sum of digits gives 20186666852.

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, 230243 + ... + 305589.

It is an arithmetic number, because the mean of its divisors is an integer number (1606042620).

Almost surely, 2^20186666852 is an apocalyptic number.

20186666852 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20186666852 is a deficient number, since it is larger than the sum of its proper divisors (18358356028).

20186666852 is a wasteful number, since it uses less digits than its factorization.

20186666852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81451 (or 81449 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 20186666852 in words is "twenty billion, one hundred eighty-six million, six hundred sixty-six thousand, eight hundred fifty-two".