23681820 has 96 divisors (see below), whose sum is σ = 69366528. Its totient is φ = 6031872.

The previous prime is 23681807. The next prime is 23681821. The reversal of 23681820 is 2818632.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23681821) 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, 172792 + ... + 172928.

It is an arithmetic number, because the mean of its divisors is an integer number (722568).

Almost surely, 2^23681820 is an apocalyptic number.

23681820 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 23681820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34683264).

23681820 is an abundant number, since it is smaller than the sum of its proper divisors (45684708).

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

23681820 is a wasteful number, since it uses less digits than its factorization.

23681820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 23681820 is about 4866.3970244936. The cubic root of 23681820 is about 287.1695308081.

The spelling of 23681820 in words is "twenty-three million, six hundred eighty-one thousand, eight hundred twenty".