261136020 has 48 divisors (see below), whose sum is σ = 762975360. Its totient is φ = 66608256.

The previous prime is 261136013. The next prime is 261136021. The reversal of 261136020 is 20631162.

It is a happy number.

261136020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261136021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93235 + ... + 95994.

It is an arithmetic number, because the mean of its divisors is an integer number (15895320).

Almost surely, 2^261136020 is an apocalyptic number.

261136020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261136020 is an abundant number, since it is smaller than the sum of its proper divisors (501839340).

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

261136020 is a wasteful number, since it uses less digits than its factorization.

261136020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189264 (or 189262 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 261136020 is about 16159.7035863904. The cubic root of 261136020 is about 639.1786501401.

Adding to 261136020 its reverse (20631162), we get a palindrome (281767182).

The spelling of 261136020 in words is "two hundred sixty-one million, one hundred thirty-six thousand, twenty".