20535897288991 has 16 divisors (see below), whose sum is σ = 23519618519040. Its totient is φ = 17564684670720.

The previous prime is 20535897288943. The next prime is 20535897288997. The reversal of 20535897288991 is 19988279853502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20535897288991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535897288997) 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, 84934831 + ... + 85176271.

It is an arithmetic number, because the mean of its divisors is an integer number (1469976157440).

Almost surely, 2^{20535897288991} is an apocalyptic number.

20535897288991 is a deficient number, since it is larger than the sum of its proper divisors (2983721230049).

20535897288991 is a wasteful number, since it uses less digits than its factorization.

20535897288991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267294.

The product of its (nonzero) digits is 783820800, while the sum is 76.

The spelling of 20535897288991 in words is "twenty trillion, five hundred thirty-five billion, eight hundred ninety-seven million, two hundred eighty-eight thousand, nine hundred ninety-one".