205676989 has 16 divisors (see below), whose sum is σ = 241678080. Its totient is φ = 171400320.

The previous prime is 205676983. The next prime is 205677001. The reversal of 205676989 is 989676502.

It is a happy number.

It is not a de Polignac number, because 205676989 - 2¹⁵ = 205644221 is a prime.

It is a super-2 number, since 2×205676989² = 84606047608212242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205676983) 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, 33447 + ... + 39115.

It is an arithmetic number, because the mean of its divisors is an integer number (15104880).

Almost surely, 2^205676989 is an apocalyptic number.

It is an amenable number.

205676989 is a deficient number, since it is larger than the sum of its proper divisors (36001091).

205676989 is an equidigital number, since it uses as much as digits as its factorization.

205676989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5820.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 205676989 is about 14341.4430584931. The cubic root of 205676989 is about 590.2852101852.

It can be divided in two parts, 20567 and 6989, that added together give a square (27556 = 166²).

The spelling of 205676989 in words is "two hundred five million, six hundred seventy-six thousand, nine hundred eighty-nine".