20558935555 has 8 divisors (see below), whose sum is σ = 24693937632. Its totient is φ = 16431671808.

The previous prime is 20558935547. The next prime is 20558935571. The reversal of 20558935555 is 55553985502.

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 20558935555 - 2³ = 20558935547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1928734 + ... + 1939363.

It is an arithmetic number, because the mean of its divisors is an integer number (3086742204).

Almost surely, 2^20558935555 is an apocalyptic number.

20558935555 is a deficient number, since it is larger than the sum of its proper divisors (4135002077).

20558935555 is a wasteful number, since it uses less digits than its factorization.

20558935555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869165.

The product of its (nonzero) digits is 6750000, while the sum is 52.

The spelling of 20558935555 in words is "twenty billion, five hundred fifty-eight million, nine hundred thirty-five thousand, five hundred fifty-five".