205420550 has 48 divisors (see below), whose sum is σ = 396885312. Its totient is φ = 79046400.

The previous prime is 205420549. The next prime is 205420573. The reversal of 205420550 is 55024502.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 142634 + ... + 144066.

It is an arithmetic number, because the mean of its divisors is an integer number (8268444).

Almost surely, 2^205420550 is an apocalyptic number.

205420550 is a deficient number, since it is larger than the sum of its proper divisors (191464762).

205420550 is a wasteful number, since it uses less digits than its factorization.

205420550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553 (or 1548 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 205420550 is about 14332.4997819641. The cubic root of 205420550 is about 590.0397847346.

The spelling of 205420550 in words is "two hundred five million, four hundred twenty thousand, five hundred fifty".