205700816 has 20 divisors (see below), whose sum is σ = 421989732. Its totient is φ = 96800256.

The previous prime is 205700801. The next prime is 205700827. The reversal of 205700816 is 618007502.

It can be written as a sum of positive squares in 2 ways, for example, as 71233600 + 134467216 = 8440^2 + 11596^2 .

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 3 ways as a sum of consecutive naturals, for example, 377855 + ... + 378398.

Almost surely, 2^205700816 is an apocalyptic number.

It is an amenable number.

205700816 is an abundant number, since it is smaller than the sum of its proper divisors (216288916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205700816 is a wasteful number, since it uses less digits than its factorization.

205700816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756278 (or 756272 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 205700816 is about 14342.2737388463. The cubic root of 205700816 is about 590.3080035025.

The spelling of 205700816 in words is "two hundred five million, seven hundred thousand, eight hundred sixteen".