205742650 has 24 divisors (see below), whose sum is σ = 383368320. Its totient is φ = 82149360.

The previous prime is 205742611. The next prime is 205742651. The reversal of 205742650 is 56247502.

It is not an unprimeable number, because it can be changed into a prime (205742651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26961 + ... + 33739.

It is an arithmetic number, because the mean of its divisors is an integer number (15973680).

Almost surely, 2^205742650 is an apocalyptic number.

205742650 is a deficient number, since it is larger than the sum of its proper divisors (177625670).

205742650 is a wasteful number, since it uses less digits than its factorization.

205742650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7398 (or 7393 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 205742650 is about 14343.7320805988. The cubic root of 205742650 is about 590.3480183675.

The spelling of 205742650 in words is "two hundred five million, seven hundred forty-two thousand, six hundred fifty".