20555011545 has 32 divisors (see below), whose sum is σ = 33800215680. Its totient is φ = 10660354560.

The previous prime is 20555011531. The next prime is 20555011549. The reversal of 20555011545 is 54511055502.

It is not a de Polignac number, because 20555011545 - 2⁷ = 20555011417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555011549) 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 31 ways as a sum of consecutive naturals, for example, 134371 + ... + 243239.

It is an arithmetic number, because the mean of its divisors is an integer number (1056256740).

Almost surely, 2^20555011545 is an apocalyptic number.

It is an amenable number.

20555011545 is a deficient number, since it is larger than the sum of its proper divisors (13245204135).

20555011545 is a wasteful number, since it uses less digits than its factorization.

20555011545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109225.

The product of its (nonzero) digits is 25000, while the sum is 33.

The spelling of 20555011545 in words is "twenty billion, five hundred fifty-five million, eleven thousand, five hundred forty-five".