20164256636 has 6 divisors (see below), whose sum is σ = 35287449120. Its totient is φ = 10082128316.

The previous prime is 20164256627. The next prime is 20164256641. The reversal of 20164256636 is 63665246102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20164256593 and 20164256602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2520532076 + ... + 2520532083.

It is an arithmetic number, because the mean of its divisors is an integer number (5881241520).

Almost surely, 2^20164256636 is an apocalyptic number.

It is an amenable number.

20164256636 is a deficient number, since it is larger than the sum of its proper divisors (15123192484).

20164256636 is a wasteful number, since it uses less digits than its factorization.

20164256636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041064163 (or 5041064161 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 20164256636 in words is "twenty billion, one hundred sixty-four million, two hundred fifty-six thousand, six hundred thirty-six".