205023634 has 4 divisors (see below), whose sum is σ = 307535454. Its totient is φ = 102511816.

The previous prime is 205023619. The next prime is 205023653. The reversal of 205023634 is 436320502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 186404409 + 18619225 = 13653^2 + 4315^2 .

It is a junction number, because it is equal to n+sod(n) for n = 205023599 and 205023608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51255907 + ... + 51255910.

Almost surely, 2^205023634 is an apocalyptic number.

205023634 is a deficient number, since it is larger than the sum of its proper divisors (102511820).

205023634 is a wasteful number, since it uses less digits than its factorization.

205023634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102511819.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 205023634 is about 14318.6463745705. The cubic root of 205023634 is about 589.6595124392.

The spelling of 205023634 in words is "two hundred five million, twenty-three thousand, six hundred thirty-four".