23520420 has 144 divisors (see below), whose sum is σ = 89002368. Its totient is φ = 4884480.

The previous prime is 23520403. The next prime is 23520443. The reversal of 23520420 is 2402532.

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 = 23520393 and 23520402.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13012 + ... + 14708.

It is an arithmetic number, because the mean of its divisors is an integer number (618072).

Almost surely, 2^23520420 is an apocalyptic number.

23520420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

23520420 is the 3960-th pentagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23520420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44501184).

23520420 is an abundant number, since it is smaller than the sum of its proper divisors (65481948).

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

23520420 is a wasteful number, since it uses less digits than its factorization.

23520420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 23520420 is about 4849.7855622697. The cubic root of 23520420 is about 286.5156556963.

Adding to 23520420 its reverse (2402532), we get a palindrome (25922952).

The spelling of 23520420 in words is "twenty-three million, five hundred twenty thousand, four hundred twenty".