20535748466687 has 32 divisors (see below), whose sum is σ = 21189753446400. Its totient is φ = 19895871996000.

The previous prime is 20535748466641. The next prime is 20535748466771. The reversal of 20535748466687 is 78666484753502.

It is a cyclic number.

It is not a de Polignac number, because 20535748466687 - 2²⁰ = 20535747418111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (71).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20535748466687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535748466617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390513398 + ... + 390565980.

It is an arithmetic number, because the mean of its divisors is an integer number (662179795200).

Almost surely, 2^{20535748466687} is an apocalyptic number.

20535748466687 is a deficient number, since it is larger than the sum of its proper divisors (654004979713).

20535748466687 is a wasteful number, since it uses less digits than its factorization.

20535748466687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53195.

The product of its (nonzero) digits is 1625702400, while the sum is 71.

The spelling of 20535748466687 in words is "twenty trillion, five hundred thirty-five billion, seven hundred forty-eight million, four hundred sixty-six thousand, six hundred eighty-seven".