20987159599 has 8 divisors (see below), whose sum is σ = 23996142368. Its totient is φ = 17980881120.

The previous prime is 20987159551. The next prime is 20987159693. The reversal of 20987159599 is 99595178902.

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 20987159599 - 2¹³ = 20987151407 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 20987159599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20987150599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659412 + ... + 690505.

It is an arithmetic number, because the mean of its divisors is an integer number (2999517796).

Almost surely, 2^20987159599 is an apocalyptic number.

20987159599 is a deficient number, since it is larger than the sum of its proper divisors (3008982769).

20987159599 is a wasteful number, since it uses less digits than its factorization.

20987159599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352145.

The product of its (nonzero) digits is 18370800, while the sum is 64.

The spelling of 20987159599 in words is "twenty billion, nine hundred eighty-seven million, one hundred fifty-nine thousand, five hundred ninety-nine".