205215964 has 24 divisors (see below), whose sum is σ = 364582400. Its totient is φ = 101060784.

The previous prime is 205215961. The next prime is 205216003. The reversal of 205215964 is 469512502.

It is a happy number.

It is a super-2 number, since 2×205215964² = 84227183760898592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205215961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80737 + ... + 83239.

Almost surely, 2^205215964 is an apocalyptic number.

It is an amenable number.

205215964 is a deficient number, since it is larger than the sum of its proper divisors (159366436).

205215964 is a wasteful number, since it uses less digits than its factorization.

205215964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2809 (or 2807 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 205215964 is about 14325.3608680549. The cubic root of 205215964 is about 589.8438387820.

The spelling of 205215964 in words is "two hundred five million, two hundred fifteen thousand, nine hundred sixty-four".