205420435 has 32 divisors (see below), whose sum is σ = 288271872. Its totient is φ = 138862080.

The previous prime is 205420433. The next prime is 205420441. The reversal of 205420435 is 534024502.

It is not a de Polignac number, because 205420435 - 2¹ = 205420433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205420433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76282 + ... + 78928.

It is an arithmetic number, because the mean of its divisors is an integer number (9008496).

Almost surely, 2^205420435 is an apocalyptic number.

205420435 is a deficient number, since it is larger than the sum of its proper divisors (82851437).

205420435 is a wasteful number, since it uses less digits than its factorization.

205420435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 205420435 is about 14332.4957701023. The cubic root of 205420435 is about 590.0396746278.

Adding to 205420435 its reverse (534024502), we get a palindrome (739444937).

The spelling of 205420435 in words is "two hundred five million, four hundred twenty thousand, four hundred thirty-five".