205443420 has 192 divisors, whose sum is σ = 715309056. Its totient is φ = 42900480.

The previous prime is 205443401. The next prime is 205443431. The reversal of 205443420 is 24344502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1042762 + ... + 1042958.

It is an arithmetic number, because the mean of its divisors is an integer number (3725568).

Almost surely, 2^205443420 is an apocalyptic number.

205443420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205443420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (357654528).

205443420 is an abundant number, since it is smaller than the sum of its proper divisors (509865636).

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

205443420 is a wasteful number, since it uses less digits than its factorization.

205443420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 205443420 is about 14333.2975968547. The cubic root of 205443420 is about 590.0616808061.

Adding to 205443420 its reverse (24344502), we get a palindrome (229787922).

The spelling of 205443420 in words is "two hundred five million, four hundred forty-three thousand, four hundred twenty".