205521416 has 8 divisors (see below), whose sum is σ = 385352670. Its totient is φ = 102760704.

The previous prime is 205521403. The next prime is 205521431. The reversal of 205521416 is 614125502.

It can be written as a sum of positive squares in only one way, i.e., 153016900 + 52504516 = 12370^2 + 7246^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845081 + ... + 12845096.

Almost surely, 2^205521416 is an apocalyptic number.

It is an amenable number.

205521416 is a deficient number, since it is larger than the sum of its proper divisors (179831254).

205521416 is a wasteful number, since it uses less digits than its factorization.

205521416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25690183 (or 25690179 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 205521416 is about 14336.0181361492. The cubic root of 205521416 is about 590.1363430950.

Adding to 205521416 its reverse (614125502), we get a palindrome (819646918).

The spelling of 205521416 in words is "two hundred five million, five hundred twenty-one thousand, four hundred sixteen".