20559913791 has 8 divisors (see below), whose sum is σ = 27413950080. Its totient is φ = 13706243352.

The previous prime is 20559913783. The next prime is 20559913823. The reversal of 20559913791 is 19731995502.

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

It is not a de Polignac number, because 20559913791 - 2³ = 20559913783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20559913991) 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, 92566 + ... + 222908.

It is an arithmetic number, because the mean of its divisors is an integer number (3426743760).

Almost surely, 2^20559913791 is an apocalyptic number.

20559913791 is a deficient number, since it is larger than the sum of its proper divisors (6854036289).

20559913791 is a wasteful number, since it uses less digits than its factorization.

20559913791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182925.

The product of its (nonzero) digits is 765450, while the sum is 51.

The spelling of 20559913791 in words is "twenty billion, five hundred fifty-nine million, nine hundred thirteen thousand, seven hundred ninety-one".