20168586436 has 12 divisors (see below), whose sum is σ = 35316338428. Its totient is φ = 10078204032.

The previous prime is 20168586433. The next prime is 20168586437. The reversal of 20168586436 is 63468586102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14040828036 + 6127758400 = 118494^2 + 78280^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20168586436.

It is not an unprimeable number, because it can be changed into a prime (20168586433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514841 + ... + 1528096.

Almost surely, 2^20168586436 is an apocalyptic number.

It is an amenable number.

20168586436 is a deficient number, since it is larger than the sum of its proper divisors (15147751992).

20168586436 is a wasteful number, since it uses less digits than its factorization.

20168586436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044598 (or 3044596 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 20168586436 in words is "twenty billion, one hundred sixty-eight million, five hundred eighty-six thousand, four hundred thirty-six".