23403420 has 72 divisors (see below), whose sum is σ = 74090016. Its totient is φ = 5968512.

The previous prime is 23403379. The next prime is 23403431. The reversal of 23403420 is 2430432.

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 = 23403393 and 23403402.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1314 + ... + 6966.

It is an arithmetic number, because the mean of its divisors is an integer number (1029028).

Almost surely, 2^23403420 is an apocalyptic number.

23403420 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 23403420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37045008).

23403420 is an abundant number, since it is smaller than the sum of its proper divisors (50686596).

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

23403420 is a wasteful number, since it uses less digits than its factorization.

23403420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691 (or 5686 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 23403420 is about 4837.7081350573. The cubic root of 23403420 is about 286.0397845122.

Adding to 23403420 its reverse (2430432), we get a palindrome (25833852).

The spelling of 23403420 in words is "twenty-three million, four hundred three thousand, four hundred twenty".