20204870688591 has 8 divisors (see below), whose sum is σ = 26939929999104. Its totient is φ = 13469862585240.

The previous prime is 20204870688517. The next prime is 20204870688671. The reversal of 20204870688591 is 19588607840202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20204870688591 - 2¹⁷ = 20204870557519 is a prime.

It is a super-3 number, since 3×20204870688591³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204870688391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11871465 + ... + 13466306.

It is an arithmetic number, because the mean of its divisors is an integer number (3367491249888).

Almost surely, 2^{20204870688591} is an apocalyptic number.

20204870688591 is a deficient number, since it is larger than the sum of its proper divisors (6735059310513).

20204870688591 is a wasteful number, since it uses less digits than its factorization.

20204870688591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25603581.

The product of its (nonzero) digits is 15482880, while the sum is 60.

The spelling of 20204870688591 in words is "twenty trillion, two hundred four billion, eight hundred seventy million, six hundred eighty-eight thousand, five hundred ninety-one".