23123220 has 48 divisors (see below), whose sum is σ = 65136960. Its totient is φ = 6128896.

The previous prime is 23123189. The next prime is 23123231. The reversal of 23123220 is 2232132.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 23123220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9664 + ... + 11816.

It is an arithmetic number, because the mean of its divisors is an integer number (1357020).

Almost surely, 2^23123220 is an apocalyptic number.

23123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23123220 is an abundant number, since it is smaller than the sum of its proper divisors (42013740).

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

23123220 is a wasteful number, since it uses less digits than its factorization.

23123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344 (or 2342 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 23123220 is about 4808.6609362691. The cubic root of 23123220 is about 284.8936506864.

Adding to 23123220 its reverse (2232132), we get a palindrome (25355352).

The spelling of 23123220 in words is "twenty-three million, one hundred twenty-three thousand, two hundred twenty".