205612440 has 128 divisors (see below), whose sum is σ = 685843200. Its totient is φ = 48888320.

The previous prime is 205612439. The next prime is 205612447. The reversal of 205612440 is 44216502.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 205612440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205612447) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 68491 + ... + 71429.

It is an arithmetic number, because the mean of its divisors is an integer number (5358150).

Almost surely, 2^205612440 is an apocalyptic number.

205612440 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 205612440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342921600).

205612440 is an abundant number, since it is smaller than the sum of its proper divisors (480230760).

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

205612440 is a wasteful number, since it uses less digits than its factorization.

205612440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017 (or 3013 counting only the distinct ones).

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

The square root of 205612440 is about 14339.1924458806. The cubic root of 205612440 is about 590.2234526581.

Adding to 205612440 its reverse (44216502), we get a palindrome (249828942).

The spelling of 205612440 in words is "two hundred five million, six hundred twelve thousand, four hundred forty".