205020240 has 80 divisors (see below), whose sum is σ = 640512576. Its totient is φ = 54246400.

The previous prime is 205020223. The next prime is 205020269. The reversal of 205020240 is 42020502.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28180 + ... + 34700.

Almost surely, 2^205020240 is an apocalyptic number.

205020240 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 205020240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320256288).

205020240 is an abundant number, since it is smaller than the sum of its proper divisors (435492336).

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

205020240 is a wasteful number, since it uses less digits than its factorization.

205020240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6668 (or 6662 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 205020240 is about 14318.5278572904. The cubic root of 205020240 is about 589.6562586429.

Adding to 205020240 its reverse (42020502), we get a palindrome (247040742).

The spelling of 205020240 in words is "two hundred five million, twenty thousand, two hundred forty".