23281020 has 120 divisors (see below), whose sum is σ = 83507424. Its totient is φ = 5318784.

The previous prime is 23281009. The next prime is 23281033. The reversal of 23281020 is 2018232.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 23280984 and 23281002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10314 + ... + 12366.

Almost surely, 2^23281020 is an apocalyptic number.

23281020 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 23281020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41753712).

23281020 is an abundant number, since it is smaller than the sum of its proper divisors (60226404).

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

23281020 is a wasteful number, since it uses less digits than its factorization.

23281020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081 (or 2070 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 23281020 is about 4825.0409324689. The cubic root of 23281020 is about 285.5402494876.

Adding to 23281020 its reverse (2018232), we get a palindrome (25299252).

The spelling of 23281020 in words is "twenty-three million, two hundred eighty-one thousand, twenty".