23165560 has 128 divisors (see below), whose sum is σ = 63763200. Its totient is φ = 7464960.

The previous prime is 23165557. The next prime is 23165563. The reversal of 23165560 is 6556132.

It is an interprime number because it is at equal distance from previous prime (23165557) and next prime (23165563).

It is a super-2 number, since 2×23165560² = 1073286340227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23165563) 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 31 ways as a sum of consecutive naturals, for example, 142039 + ... + 142201.

It is an arithmetic number, because the mean of its divisors is an integer number (498150).

Almost surely, 2^23165560 is an apocalyptic number.

23165560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23165560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31881600).

23165560 is an abundant number, since it is smaller than the sum of its proper divisors (40597640).

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

23165560 is a wasteful number, since it uses less digits than its factorization.

23165560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 23165560 is about 4813.0613958270. The cubic root of 23165560 is about 285.0674304386.

The spelling of 23165560 in words is "twenty-three million, one hundred sixty-five thousand, five hundred sixty".