23001231220 has 36 divisors (see below), whose sum is σ = 53092930212. Its totient is φ = 8364083200.

The previous prime is 23001231191. The next prime is 23001231229. The reversal of 23001231220 is 2213210032.

It can be written as a sum of positive squares in 2 ways, for example, as 3368177296 + 19633053924 = 58036^2 + 140118^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23001231194 and 23001231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23001231229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4749901 + ... + 4754740.

It is an arithmetic number, because the mean of its divisors is an integer number (1474803617).

Almost surely, 2^23001231220 is an apocalyptic number.

23001231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23001231220 is an abundant number, since it is smaller than the sum of its proper divisors (30091698992).

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

23001231220 is a wasteful number, since it uses less digits than its factorization.

23001231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9504672 (or 9504659 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 23001231220 its reverse (2213210032), we get a palindrome (25214441252).

The spelling of 23001231220 in words is "twenty-three billion, one million, two hundred thirty-one thousand, two hundred twenty".