20558243625 has 16 divisors (see below), whose sum is σ = 34208918016. Its totient is φ = 10964396400.

The previous prime is 20558243611. The next prime is 20558243647. The reversal of 20558243625 is 52634285502.

It is not a de Polignac number, because 20558243625 - 2⁴ = 20558243609 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 27410617 + ... + 27411366.

It is an arithmetic number, because the mean of its divisors is an integer number (2138057376).

Almost surely, 2^20558243625 is an apocalyptic number.

20558243625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20558243625 is a deficient number, since it is larger than the sum of its proper divisors (13650674391).

20558243625 is an equidigital number, since it uses as much as digits as its factorization.

20558243625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54822001 (or 54821991 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 20558243625 in words is "twenty billion, five hundred fifty-eight million, two hundred forty-three thousand, six hundred twenty-five".