205420830 has 32 divisors (see below), whose sum is σ = 493388064. Its totient is φ = 54736896.

The previous prime is 205420807. The next prime is 205420903. The reversal of 205420830 is 38024502.

It is a self number, because there is not a number n which added to its sum of digits gives 205420830.

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, 71094 + ... + 73926.

It is an arithmetic number, because the mean of its divisors is an integer number (15418377).

Almost surely, 2^205420830 is an apocalyptic number.

205420830 is an abundant number, since it is smaller than the sum of its proper divisors (287967234).

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

205420830 is a wasteful number, since it uses less digits than its factorization.

205420830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 205420830 is about 14332.5095499707. The cubic root of 205420830 is about 590.0400528205.

The spelling of 205420830 in words is "two hundred five million, four hundred twenty thousand, eight hundred thirty".