20559913793 has 4 divisors (see below), whose sum is σ = 20633081028. Its totient is φ = 20486746560.

The previous prime is 20559913783. The next prime is 20559913823. The reversal of 20559913793 is 39731995502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15630750529 + 4929163264 = 125023^2 + 70208^2 .

It is a cyclic number.

It is not a de Polignac number, because 20559913793 - 2¹² = 20559909697 is a prime.

It is a super-3 number, since 3×20559913793³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20559913723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36583196 + ... + 36583757.

It is an arithmetic number, because the mean of its divisors is an integer number (5158270257).

Almost surely, 2^20559913793 is an apocalyptic number.

It is an amenable number.

20559913793 is a deficient number, since it is larger than the sum of its proper divisors (73167235).

20559913793 is an equidigital number, since it uses as much as digits as its factorization.

20559913793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73167234.

The product of its (nonzero) digits is 2296350, while the sum is 53.

The spelling of 20559913793 in words is "twenty billion, five hundred fifty-nine million, nine hundred thirteen thousand, seven hundred ninety-three".