205212066 has 32 divisors (see below), whose sum is σ = 435181248. Its totient is φ = 64289280.

The previous prime is 205212053. The next prime is 205212067. The reversal of 205212066 is 660212502.

It is a super-2 number, since 2×205212066² = 84223984063976712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205212067) 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, 133981 + ... + 135503.

It is an arithmetic number, because the mean of its divisors is an integer number (13599414).

Almost surely, 2^205212066 is an apocalyptic number.

205212066 is an abundant number, since it is smaller than the sum of its proper divisors (229969182).

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

205212066 is a wasteful number, since it uses less digits than its factorization.

205212066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 205212066 is about 14325.2248149898. The cubic root of 205212066 is about 589.8401041378.

Adding to 205212066 its reverse (660212502), we get a palindrome (865424568).

The spelling of 205212066 in words is "two hundred five million, two hundred twelve thousand, sixty-six".