205731420 has 48 divisors (see below), whose sum is σ = 576864288. Its totient is φ = 54784000.

The previous prime is 205731419. The next prime is 205731431. The reversal of 205731420 is 24137502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49420 + ... + 53420.

It is an arithmetic number, because the mean of its divisors is an integer number (12018006).

Almost surely, 2^205731420 is an apocalyptic number.

205731420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205731420 is an abundant number, since it is smaller than the sum of its proper divisors (371132868).

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

205731420 is a wasteful number, since it uses less digits than its factorization.

205731420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4870 (or 4868 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 205731420 is about 14343.3406150729. The cubic root of 205731420 is about 590.3372772322.

Adding to 205731420 its reverse (24137502), we get a palindrome (229868922).

The spelling of 205731420 in words is "two hundred five million, seven hundred thirty-one thousand, four hundred twenty".