205021415 has 16 divisors (see below), whose sum is σ = 249945696. Its totient is φ = 161424000.

The previous prime is 205021367. The next prime is 205021417. The reversal of 205021415 is 514120502.

It is not a de Polignac number, because 205021415 - 2²² = 200827111 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205021417) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 90284 + ... + 92526.

It is an arithmetic number, because the mean of its divisors is an integer number (15621606).

Almost surely, 2^205021415 is an apocalyptic number.

205021415 is a deficient number, since it is larger than the sum of its proper divisors (44924281).

205021415 is a wasteful number, since it uses less digits than its factorization.

205021415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2530.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 205021415 is about 14318.5688879860. The cubic root of 205021415 is about 589.6573851085.

Adding to 205021415 its reverse (514120502), we get a palindrome (719141917).

The spelling of 205021415 in words is "two hundred five million, twenty-one thousand, four hundred fifteen".