205319890 has 32 divisors (see below), whose sum is σ = 391561920. Its totient is φ = 77298624.

The previous prime is 205319887. The next prime is 205319893. The reversal of 205319890 is 98913502.

It is an interprime number because it is at equal distance from previous prime (205319887) and next prime (205319893).

It is a super-2 number, since 2×205319890² = 84312514459224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205319893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26389 + ... + 33271.

It is an arithmetic number, because the mean of its divisors is an integer number (12236310).

Almost surely, 2^205319890 is an apocalyptic number.

205319890 is a deficient number, since it is larger than the sum of its proper divisors (186242030).

205319890 is a wasteful number, since it uses less digits than its factorization.

205319890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 205319890 is about 14328.9877521059. The cubic root of 205319890 is about 589.9433920600.

The spelling of 205319890 in words is "two hundred five million, three hundred nineteen thousand, eight hundred ninety".