205143105 has 16 divisors (see below), whose sum is σ = 328426560. Its totient is φ = 109343808.

The previous prime is 205143101. The next prime is 205143121. The reversal of 205143105 is 501341502.

It is not a de Polignac number, because 205143105 - 2² = 205143101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205143101) 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, 31674 + ... + 37596.

It is an arithmetic number, because the mean of its divisors is an integer number (20526660).

Almost surely, 2^205143105 is an apocalyptic number.

It is an amenable number.

205143105 is a deficient number, since it is larger than the sum of its proper divisors (123283455).

205143105 is a wasteful number, since it uses less digits than its factorization.

205143105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8240.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 205143105 is about 14322.8176348092. The cubic root of 205143105 is about 589.7740253062.

Adding to 205143105 its reverse (501341502), we get a palindrome (706484607).

The spelling of 205143105 in words is "two hundred five million, one hundred forty-three thousand, one hundred five".