205147842 has 32 divisors (see below), whose sum is σ = 419515200. Its totient is φ = 66855360.

The previous prime is 205147793. The next prime is 205147849. The reversal of 205147842 is 248741502.

It is not an unprimeable number, because it can be changed into a prime (205147849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104284 + ... + 106232.

It is an arithmetic number, because the mean of its divisors is an integer number (13109850).

Almost surely, 2^205147842 is an apocalyptic number.

205147842 is an abundant number, since it is smaller than the sum of its proper divisors (214367358).

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

205147842 is a wasteful number, since it uses less digits than its factorization.

205147842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 205147842 is about 14322.9829993616. The cubic root of 205147842 is about 589.7785648008.

The spelling of 205147842 in words is "two hundred five million, one hundred forty-seven thousand, eight hundred forty-two".