205012290 has 64 divisors (see below), whose sum is σ = 566820864. Its totient is φ = 46484928.

The previous prime is 205012289. The next prime is 205012307. The reversal of 205012290 is 92210502.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22827 + ... + 30513.

It is an arithmetic number, because the mean of its divisors is an integer number (8856576).

Almost surely, 2^205012290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205012290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283410432).

205012290 is an abundant number, since it is smaller than the sum of its proper divisors (361808574).

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

205012290 is a wasteful number, since it uses less digits than its factorization.

205012290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7831.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 205012290 is about 14318.2502422607. The cubic root of 205012290 is about 589.6486369111.

Adding to 205012290 its reverse (92210502), we get a palindrome (297222792).

It can be divided in two parts, 20501 and 2290, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 205012290 in words is "two hundred five million, twelve thousand, two hundred ninety".