205020415 has 4 divisors (see below), whose sum is σ = 246024504. Its totient is φ = 164016328.

The previous prime is 205020383. The next prime is 205020421. The reversal of 205020415 is 514020502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205020415 - 2⁵ = 205020383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205020392 and 205020401.

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 3 ways as a sum of consecutive naturals, for example, 20502037 + ... + 20502046.

It is an arithmetic number, because the mean of its divisors is an integer number (61506126).

Almost surely, 2^205020415 is an apocalyptic number.

205020415 is a deficient number, since it is larger than the sum of its proper divisors (41004089).

205020415 is an equidigital number, since it uses as much as digits as its factorization.

205020415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41004088.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 205020415 is about 14318.5339682525. The cubic root of 205020415 is about 589.6564264146.

Adding to 205020415 its reverse (514020502), we get a palindrome (719040917).

The spelling of 205020415 in words is "two hundred five million, twenty thousand, four hundred fifteen".