205661434 has 16 divisors (see below), whose sum is σ = 354250080. Its totient is φ = 88562160.

The previous prime is 205661381. The next prime is 205661441. The reversal of 205661434 is 434166502.

It is a junction number, because it is equal to n+sod(n) for n = 205661396 and 205661405.

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, 245589 + ... + 246424.

It is an arithmetic number, because the mean of its divisors is an integer number (22140630).

Almost surely, 2^205661434 is an apocalyptic number.

205661434 is a deficient number, since it is larger than the sum of its proper divisors (148588646).

205661434 is a wasteful number, since it uses less digits than its factorization.

205661434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492045.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 205661434 is about 14340.9007387960. The cubic root of 205661434 is about 590.2703290554.

The spelling of 205661434 in words is "two hundred five million, six hundred sixty-one thousand, four hundred thirty-four".