20864028317553 has 40 divisors (see below), whose sum is σ = 31271136462720. Its totient is φ = 13863053365920.

The previous prime is 20864028317537. The next prime is 20864028317557. The reversal of 20864028317553 is 35571382046802.

20864028317553 is a `hidden beast` number, since 2 + 0 + 8 + 6 + 4 + 0 + 2 + 83 + 1 + 7 + 553 = 666.

It is not a de Polignac number, because 20864028317553 - 2⁴ = 20864028317537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20864028317553.

It is not an unprimeable number, because it can be changed into a prime (20864028317557) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 35719576 + ... + 36298982.

It is an arithmetic number, because the mean of its divisors is an integer number (781778411568).

Almost surely, 2^{20864028317553} is an apocalyptic number.

It is an amenable number.

20864028317553 is a deficient number, since it is larger than the sum of its proper divisors (10407108145167).

20864028317553 is a wasteful number, since it uses less digits than its factorization.

20864028317553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580899 (or 580890 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 20864028317553 in words is "twenty trillion, eight hundred sixty-four billion, twenty-eight million, three hundred seventeen thousand, five hundred fifty-three".