205501550020 has 96 divisors (see below), whose sum is σ = 470763619200. Its totient is φ = 74898514944.

The previous prime is 205501550003. The next prime is 205501550027. The reversal of 205501550020 is 20055105502.

It is a happy number.

205501550020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (205501550027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14316487 + ... + 14330833.

It is an arithmetic number, because the mean of its divisors is an integer number (4903787700).

Almost surely, 2^205501550020 is an apocalyptic number.

205501550020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205501550020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235381809600).

205501550020 is an abundant number, since it is smaller than the sum of its proper divisors (265262069180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205501550020 is a wasteful number, since it uses less digits than its factorization.

205501550020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15077 (or 15075 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

Adding to 205501550020 its reverse (20055105502), we get a palindrome (225556655522).

The spelling of 205501550020 in words is "two hundred five billion, five hundred one million, five hundred fifty thousand, twenty".