20542205555 has 8 divisors (see below), whose sum is σ = 24904777632. Its totient is φ = 16264343808.

The previous prime is 20542205549. The next prime is 20542205557. The reversal of 20542205555 is 55550224502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20542205555 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20542205557) 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 7 ways as a sum of consecutive naturals, for example, 21177047 + ... + 21178016.

It is an arithmetic number, because the mean of its divisors is an integer number (3113097204).

Almost surely, 2^20542205555 is an apocalyptic number.

20542205555 is a deficient number, since it is larger than the sum of its proper divisors (4362572077).

20542205555 is an equidigital number, since it uses as much as digits as its factorization.

20542205555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42355165.

The product of its (nonzero) digits is 100000, while the sum is 35.

The spelling of 20542205555 in words is "twenty billion, five hundred forty-two million, two hundred five thousand, five hundred fifty-five".