205561430 has 32 divisors (see below), whose sum is σ = 379076544. Its totient is φ = 80234496.

The previous prime is 205561429. The next prime is 205561451. The reversal of 205561430 is 34165502.

It is a self number, because there is not a number n which added to its sum of digits gives 205561430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69359 + ... + 72261.

It is an arithmetic number, because the mean of its divisors is an integer number (11846142).

Almost surely, 2^205561430 is an apocalyptic number.

205561430 is a deficient number, since it is larger than the sum of its proper divisors (173515114).

205561430 is a wasteful number, since it uses less digits than its factorization.

205561430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 205561430 is about 14337.4136440294. The cubic root of 205561430 is about 590.1746394825.

The spelling of 205561430 in words is "two hundred five million, five hundred sixty-one thousand, four hundred thirty".