23311312220 has 144 divisors (see below), whose sum is σ = 60818419200. Its totient is φ = 7346820096.

The previous prime is 23311312207. The next prime is 23311312223. The reversal of 23311312220 is 2221311332.

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 = 23311312192 and 23311312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23311312223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1733081 + ... + 1746479.

Almost surely, 2^23311312220 is an apocalyptic number.

23311312220 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 23311312220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30409209600).

23311312220 is an abundant number, since it is smaller than the sum of its proper divisors (37507106980).

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

23311312220 is a wasteful number, since it uses less digits than its factorization.

23311312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13492 (or 13473 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 23311312220 its reverse (2221311332), we get a palindrome (25532623552).

The spelling of 23311312220 in words is "twenty-three billion, three hundred eleven million, three hundred twelve thousand, two hundred twenty".