205345590 has 16 divisors (see below), whose sum is σ = 492829488. Its totient is φ = 54758816.

The previous prime is 205345579. The next prime is 205345619. The reversal of 205345590 is 95543502.

It is a super-2 number, since 2×205345590² = 84333622664896200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3422397 + ... + 3422456.

It is an arithmetic number, because the mean of its divisors is an integer number (30801843).

Almost surely, 2^205345590 is an apocalyptic number.

205345590 is an abundant number, since it is smaller than the sum of its proper divisors (287483898).

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

205345590 is a wasteful number, since it uses less digits than its factorization.

205345590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844863.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 205345590 is about 14329.8845075597. The cubic root of 205345590 is about 589.9680055426.

The spelling of 205345590 in words is "two hundred five million, three hundred forty-five thousand, five hundred ninety".