23181380 has 24 divisors (see below), whose sum is σ = 48772248. Its totient is φ = 9255168.

The previous prime is 23181377. The next prime is 23181383. The reversal of 23181380 is 8318132.

It is an interprime number because it is at equal distance from previous prime (23181377) and next prime (23181383).

It can be written as a sum of positive squares in 4 ways, for example, as 732736 + 22448644 = 856^2 + 4738^2 .

It is not an unprimeable number, because it can be changed into a prime (23181383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18122 + ... + 19358.

It is an arithmetic number, because the mean of its divisors is an integer number (2032177).

Almost surely, 2^23181380 is an apocalyptic number.

23181380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23181380 is an abundant number, since it is smaller than the sum of its proper divisors (25590868).

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

23181380 is a wasteful number, since it uses less digits than its factorization.

23181380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 23181380 is about 4814.7045599912. The cubic root of 23181380 is about 285.1323075025.

The spelling of 23181380 in words is "twenty-three million, one hundred eighty-one thousand, three hundred eighty".