205036434 has 20 divisors (see below), whose sum is σ = 459433854. Its totient is φ = 68345424.

The previous prime is 205036423. The next prime is 205036441. The reversal of 205036434 is 434630502.

It can be written as a sum of positive squares in only one way, i.e., 155376225 + 49660209 = 12465^2 + 7047^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 205036398 and 205036407.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 632667 + ... + 632990.

Almost surely, 2^205036434 is an apocalyptic number.

205036434 is an abundant number, since it is smaller than the sum of its proper divisors (254397420).

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

205036434 is a wasteful number, since it uses less digits than its factorization.

205036434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265671 (or 1265662 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 205036434 is about 14319.0933372194. The cubic root of 205036434 is about 589.6717833573.

Adding to 205036434 its reverse (434630502), we get a palindrome (639666936).

The spelling of 205036434 in words is "two hundred five million, thirty-six thousand, four hundred thirty-four".