205113402 has 72 divisors (see below), whose sum is σ = 500613204. Its totient is φ = 60331392.

The previous prime is 205113361. The next prime is 205113407. The reversal of 205113402 is 204311502.

It can be written as a sum of positive squares in 2 ways, for example, as 188540361 + 16573041 = 13731^2 + 4071^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (205113407) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 122958 + ... + 124614.

Almost surely, 2^205113402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205113402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250306602).

205113402 is an abundant number, since it is smaller than the sum of its proper divisors (295499802).

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

205113402 is a wasteful number, since it uses less digits than its factorization.

205113402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724 (or 1698 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 205113402 is about 14321.7806853757. The cubic root of 205113402 is about 589.7455591558.

Adding to 205113402 its reverse (204311502), we get a palindrome (409424904).

The spelling of 205113402 in words is "two hundred five million, one hundred thirteen thousand, four hundred two".