205501136 has 20 divisors (see below), whose sum is σ = 415470432. Its totient is φ = 98282976.

The previous prime is 205501133. The next prime is 205501181. The reversal of 205501136 is 631105502.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205501133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278846 + ... + 279581.

Almost surely, 2^205501136 is an apocalyptic number.

It is an amenable number.

205501136 is an abundant number, since it is smaller than the sum of its proper divisors (209969296).

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

205501136 is a wasteful number, since it uses less digits than its factorization.

205501136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558458 (or 558452 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 205501136 is about 14335.3108093267. The cubic root of 205501136 is about 590.1169317219.

Adding to 205501136 its reverse (631105502), we get a palindrome (836606638).

The spelling of 205501136 in words is "two hundred five million, five hundred one thousand, one hundred thirty-six".