205826981 has 8 divisors (see below), whose sum is σ = 217133280. Its totient is φ = 194568048.

The previous prime is 205826963. The next prime is 205827031. The reversal of 205826981 is 189628502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205826981 - 2¹⁴ = 205810597 is a prime.

It is a super-2 number, since 2×205826981² = 84729492215148722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205826911) 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 7 ways as a sum of consecutive naturals, for example, 2726 + ... + 20471.

It is an arithmetic number, because the mean of its divisors is an integer number (27141660).

Almost surely, 2^205826981 is an apocalyptic number.

It is an amenable number.

205826981 is a deficient number, since it is larger than the sum of its proper divisors (11306299).

205826981 is a wasteful number, since it uses less digits than its factorization.

205826981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23683.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 205826981 is about 14346.6714258047. The cubic root of 205826981 is about 590.4286657819.

The spelling of 205826981 in words is "two hundred five million, eight hundred twenty-six thousand, nine hundred eighty-one".