20558888641 has 4 divisors (see below), whose sum is σ = 20560302000. Its totient is φ = 20557475284.

The previous prime is 20558888617. The next prime is 20558888659. The reversal of 20558888641 is 14688885502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20558888641 - 2⁷ = 20558888513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20558888941) 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 3 ways as a sum of consecutive naturals, for example, 684631 + ... + 714028.

It is an arithmetic number, because the mean of its divisors is an integer number (5140075500).

Almost surely, 2^20558888641 is an apocalyptic number.

It is an amenable number.

20558888641 is a deficient number, since it is larger than the sum of its proper divisors (1413359).

20558888641 is a wasteful number, since it uses less digits than its factorization.

20558888641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413358.

The product of its (nonzero) digits is 4915200, while the sum is 55.

The spelling of 20558888641 in words is "twenty billion, five hundred fifty-eight million, eight hundred eighty-eight thousand, six hundred forty-one".