20613164805 has 12 divisors (see below), whose sum is σ = 35729485740. Its totient is φ = 10993687872.

The previous prime is 20613164779. The next prime is 20613164821. The reversal of 20613164805 is 50846131602.

It is a happy number.

20613164805 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 3 + 1 + 648 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8966006721 + 11647158084 = 94689^2 + 107922^2 .

It is not a de Polignac number, because 20613164805 - 2¹² = 20613160709 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20613164805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229035120 + ... + 229035209.

It is an arithmetic number, because the mean of its divisors is an integer number (2977457145).

Almost surely, 2^20613164805 is an apocalyptic number.

It is an amenable number.

20613164805 is a deficient number, since it is larger than the sum of its proper divisors (15116320935).

20613164805 is a wasteful number, since it uses less digits than its factorization.

20613164805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458070340 (or 458070337 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20613164805 in words is "twenty billion, six hundred thirteen million, one hundred sixty-four thousand, eight hundred five".