20425541555 has 4 divisors (see below), whose sum is σ = 24510649872. Its totient is φ = 16340433240.

The previous prime is 20425541533. The next prime is 20425541593. The reversal of 20425541555 is 55514552402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20425541555 - 2¹⁴ = 20425525171 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2042554151 + ... + 2042554160.

It is an arithmetic number, because the mean of its divisors is an integer number (6127662468).

Almost surely, 2^20425541555 is an apocalyptic number.

20425541555 is a deficient number, since it is larger than the sum of its proper divisors (4085108317).

20425541555 is an equidigital number, since it uses as much as digits as its factorization.

20425541555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085108316.

The product of its (nonzero) digits is 200000, while the sum is 38.

The spelling of 20425541555 in words is "twenty billion, four hundred twenty-five million, five hundred forty-one thousand, five hundred fifty-five".