20145550455 has 12 divisors (see below), whose sum is σ = 34918954200. Its totient is φ = 10744293552.

The previous prime is 20145550441. The next prime is 20145550499. The reversal of 20145550455 is 55405554102.

20145550455 is a `hidden beast` number, since 2 + 0 + 145 + 5 + 504 + 5 + 5 = 666.

It is not a de Polignac number, because 20145550455 - 2⁵ = 20145550423 is a prime.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 223839405 + ... + 223839494.

It is an arithmetic number, because the mean of its divisors is an integer number (2909912850).

Almost surely, 2^20145550455 is an apocalyptic number.

20145550455 is a deficient number, since it is larger than the sum of its proper divisors (14773403745).

20145550455 is a wasteful number, since it uses less digits than its factorization.

20145550455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447678910 (or 447678907 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 36.

The spelling of 20145550455 in words is "twenty billion, one hundred forty-five million, five hundred fifty thousand, four hundred fifty-five".