205121964 has 24 divisors (see below), whose sum is σ = 479664640. Its totient is φ = 68224464.

The previous prime is 205121953. The next prime is 205121993. The reversal of 205121964 is 469121502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12904 + ... + 24015.

Almost surely, 2^205121964 is an apocalyptic number.

It is an amenable number.

205121964 is an abundant number, since it is smaller than the sum of its proper divisors (274542676).

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

205121964 is a wasteful number, since it uses less digits than its factorization.

205121964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37389 (or 37387 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 205121964 is about 14322.0795976003. The cubic root of 205121964 is about 589.7537649112.

The spelling of 205121964 in words is "two hundred five million, one hundred twenty-one thousand, nine hundred sixty-four".