23531420 has 24 divisors (see below), whose sum is σ = 53908848. Its totient is φ = 8556800.

The previous prime is 23531419. The next prime is 23531429. The reversal of 23531420 is 2413532.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 23531392 and 23531401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23531429) 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, 53261 + ... + 53700.

It is an arithmetic number, because the mean of its divisors is an integer number (2246202).

Almost surely, 2^23531420 is an apocalyptic number.

23531420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23531420 is an abundant number, since it is smaller than the sum of its proper divisors (30377428).

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

23531420 is a wasteful number, since it uses less digits than its factorization.

23531420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106981 (or 106979 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23531420 is about 4850.9195004659. The cubic root of 23531420 is about 286.5603144937.

Adding to 23531420 its reverse (2413532), we get a palindrome (25944952).

It can be divided in two parts, 2353 and 1420, that added together give a palindrome (3773).

The spelling of 23531420 in words is "twenty-three million, five hundred thirty-one thousand, four hundred twenty".