23181620 has 48 divisors (see below), whose sum is σ = 60697728. Its totient is φ = 7224960.

The previous prime is 23181619. The next prime is 23181623. The reversal of 23181620 is 2618132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23181623) 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, 5987 + ... + 9066.

It is an arithmetic number, because the mean of its divisors is an integer number (1264536).

Almost surely, 2^23181620 is an apocalyptic number.

23181620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23181620 is an abundant number, since it is smaller than the sum of its proper divisors (37516108).

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

23181620 is a wasteful number, since it uses less digits than its factorization.

23181620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15080 (or 15078 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 23181620 is about 4814.7294835743. The cubic root of 23181620 is about 285.1332915037.

Adding to 23181620 its reverse (2618132), we get a palindrome (25799752).

The spelling of 23181620 in words is "twenty-three million, one hundred eighty-one thousand, six hundred twenty".