20605968409587 has 16 divisors (see below), whose sum is σ = 30139760810880. Its totient is φ = 12418697734400.

The previous prime is 20605968409541. The next prime is 20605968409591. The reversal of 20605968409587 is 78590486950602.

It is a cyclic number.

It is not a de Polignac number, because 20605968409587 - 2²⁸ = 20605699974131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20605968409387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1744193214 + ... + 1744205027.

It is an arithmetic number, because the mean of its divisors is an integer number (1883735050680).

Almost surely, 2^{20605968409587} is an apocalyptic number.

20605968409587 is a deficient number, since it is larger than the sum of its proper divisors (9533792401293).

20605968409587 is a wasteful number, since it uses less digits than its factorization.

20605968409587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488398434.

The product of its (nonzero) digits is 261273600, while the sum is 69.

The spelling of 20605968409587 in words is "twenty trillion, six hundred five billion, nine hundred sixty-eight million, four hundred nine thousand, five hundred eighty-seven".