20928632468687 has 2 divisors, whose sum is σ = 20928632468688. Its totient is φ = 20928632468686.

The previous prime is 20928632468677. The next prime is 20928632468743. The reversal of 20928632468687 is 78686423682902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20928632468687 - 2²⁰ = 20928631420111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20928632468687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20928632468677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10464316234343 + 10464316234344.

It is an arithmetic number, because the mean of its divisors is an integer number (10464316234344).

Almost surely, 2^{20928632468687} is an apocalyptic number.

20928632468687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20928632468687 is an equidigital number, since it uses as much as digits as its factorization.

20928632468687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 668860416, while the sum is 71.

The spelling of 20928632468687 in words is "twenty trillion, nine hundred twenty-eight billion, six hundred thirty-two million, four hundred sixty-eight thousand, six hundred eighty-seven".