20991087359 has 8 divisors (see below), whose sum is σ = 22900483200. Its totient is φ = 19081877400.

The previous prime is 20991087329. The next prime is 20991087367. The reversal of 20991087359 is 95378019902.

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

It is a cyclic number.

It is not a de Polignac number, because 20991087359 - 2²⁸ = 20722651903 is a prime.

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 20991087359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20991087329) 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, 305792 + ... + 368090.

It is an arithmetic number, because the mean of its divisors is an integer number (2862560400).

Almost surely, 2^20991087359 is an apocalyptic number.

20991087359 is a deficient number, since it is larger than the sum of its proper divisors (1909395841).

20991087359 is a wasteful number, since it uses less digits than its factorization.

20991087359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92941.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The spelling of 20991087359 in words is "twenty billion, nine hundred ninety-one million, eighty-seven thousand, three hundred fifty-nine".