20550005555 has 8 divisors (see below), whose sum is σ = 25455490944. Its totient is φ = 15909681600.

The previous prime is 20550005543. The next prime is 20550005563. The reversal of 20550005555 is 55550005502.

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

It is not a de Polignac number, because 20550005555 - 2¹⁴ = 20549989171 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, 66290186 + ... + 66290495.

It is an arithmetic number, because the mean of its divisors is an integer number (3181936368).

Almost surely, 2^20550005555 is an apocalyptic number.

20550005555 is a deficient number, since it is larger than the sum of its proper divisors (4905485389).

20550005555 is a wasteful number, since it uses less digits than its factorization.

20550005555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132580717.

The product of its (nonzero) digits is 31250, while the sum is 32.

The spelling of 20550005555 in words is "twenty billion, five hundred fifty million, five thousand, five hundred fifty-five".