205012136 has 64 divisors (see below), whose sum is σ = 465696000. Its totient is φ = 82736640.

The previous prime is 205012121. The next prime is 205012141. The reversal of 205012136 is 631210502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65045 + ... + 68123.

It is an arithmetic number, because the mean of its divisors is an integer number (7276500).

Almost surely, 2^205012136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205012136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232848000).

205012136 is an abundant number, since it is smaller than the sum of its proper divisors (260683864).

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

205012136 is a wasteful number, since it uses less digits than its factorization.

205012136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162 (or 3158 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 205012136 is about 14318.2448645077. The cubic root of 205012136 is about 589.6484892680.

Adding to 205012136 its reverse (631210502), we get a palindrome (836222638).

The spelling of 205012136 in words is "two hundred five million, twelve thousand, one hundred thirty-six".