205909428 has 48 divisors (see below), whose sum is σ = 486319680. Its totient is φ = 67805184.

The previous prime is 205909427. The next prime is 205909439. The reversal of 205909428 is 824909502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205909427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551850 + ... + 552222.

It is an arithmetic number, because the mean of its divisors is an integer number (10131660).

Almost surely, 2^205909428 is an apocalyptic number.

It is an amenable number.

205909428 is an abundant number, since it is smaller than the sum of its proper divisors (280410252).

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

205909428 is a wasteful number, since it uses less digits than its factorization.

205909428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 205909428 is about 14349.5445223882. The cubic root of 205909428 is about 590.5074901966.

The spelling of 205909428 in words is "two hundred five million, nine hundred nine thousand, four hundred twenty-eight".