205303215 has 32 divisors (see below), whose sum is σ = 354465216. Its totient is φ = 100869120.

The previous prime is 205303193. The next prime is 205303223. The reversal of 205303215 is 512303502.

It is not a de Polignac number, because 205303215 - 2¹⁰ = 205302191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205303191 and 205303200.

It is a congruent number.

It is an unprimeable number.

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, 154755 + ... + 156075.

It is an arithmetic number, because the mean of its divisors is an integer number (11077038).

Almost surely, 2^205303215 is an apocalyptic number.

205303215 is a deficient number, since it is larger than the sum of its proper divisors (149162001).

205303215 is a wasteful number, since it uses less digits than its factorization.

205303215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 205303215 is about 14328.4058778358. The cubic root of 205303215 is about 589.9274209293.

Adding to 205303215 its reverse (512303502), we get a palindrome (717606717).

The spelling of 205303215 in words is "two hundred five million, three hundred three thousand, two hundred fifteen".