23506220 has 24 divisors (see below), whose sum is σ = 49552944. Its totient is φ = 9366336.

The previous prime is 23506201. The next prime is 23506229. The reversal of 23506220 is 2260532.

23506220 = 747² + 748² + ... + 786².

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 = 23506192 and 23506201.

It is not an unprimeable number, because it can be changed into a prime (23506229) 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 7 ways as a sum of consecutive naturals, for example, 3419 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (2064706).

Almost surely, 2^23506220 is an apocalyptic number.

23506220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23506220 is an abundant number, since it is smaller than the sum of its proper divisors (26046724).

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

23506220 is a wasteful number, since it uses less digits than its factorization.

23506220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4529 (or 4527 counting only the distinct ones).

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

The square root of 23506220 is about 4848.3213589860. The cubic root of 23506220 is about 286.4579846549.

Adding to 23506220 its reverse (2260532), we get a palindrome (25766752).

The spelling of 23506220 in words is "twenty-three million, five hundred six thousand, two hundred twenty".