205511264420 has 48 divisors (see below), whose sum is σ = 538065859968. Its totient is φ = 64055458560.

The previous prime is 205511264377. The next prime is 205511264423. The reversal of 205511264420 is 24462115502.

205511264420 is digitally balanced in base 2, 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 (205511264423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66722897 + ... + 66725976.

It is an arithmetic number, because the mean of its divisors is an integer number (11209705416).

Almost surely, 2^205511264420 is an apocalyptic number.

205511264420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205511264420 is an abundant number, since it is smaller than the sum of its proper divisors (332554595548).

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

205511264420 is a wasteful number, since it uses less digits than its factorization.

205511264420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133448900 (or 133448898 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 205511264420 its reverse (24462115502), we get a palindrome (229973379922).

The spelling of 205511264420 in words is "two hundred five billion, five hundred eleven million, two hundred sixty-four thousand, four hundred twenty".