205105442140 has 12 divisors (see below), whose sum is σ = 430721428536. Its totient is φ = 82042176848.

The previous prime is 205105442131. The next prime is 205105442167. The reversal of 205105442140 is 41244501502.

It is a junction number, because it is equal to n+sod(n) for n = 205105442099 and 205105442108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5127636034 + ... + 5127636073.

It is an arithmetic number, because the mean of its divisors is an integer number (35893452378).

Almost surely, 2^205105442140 is an apocalyptic number.

205105442140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205105442140 is an abundant number, since it is smaller than the sum of its proper divisors (225615986396).

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

205105442140 is a wasteful number, since it uses less digits than its factorization.

205105442140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10255272116 (or 10255272114 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 205105442140 its reverse (41244501502), we get a palindrome (246349943642).

The spelling of 205105442140 in words is "two hundred five billion, one hundred five million, four hundred forty-two thousand, one hundred forty".