20864708645 has 16 divisors (see below), whose sum is σ = 27317459520. Its totient is φ = 15172300800.

The previous prime is 20864708609. The next prime is 20864708693. The reversal of 20864708645 is 54680746802.

It is a happy number.

It is not a de Polignac number, because 20864708645 - 2²² = 20860514341 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20864708593 and 20864708602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479141 + ... + 520869.

It is an arithmetic number, because the mean of its divisors is an integer number (1707341220).

Almost surely, 2^20864708645 is an apocalyptic number.

It is an amenable number.

20864708645 is a deficient number, since it is larger than the sum of its proper divisors (6452750875).

20864708645 is a wasteful number, since it uses less digits than its factorization.

20864708645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50836.

The product of its (nonzero) digits is 2580480, while the sum is 50.

The spelling of 20864708645 in words is "twenty billion, eight hundred sixty-four million, seven hundred eight thousand, six hundred forty-five".