23311123020 has 144 divisors (see below), whose sum is σ = 73582629120. Its totient is φ = 5968706688.

The previous prime is 23311123007. The next prime is 23311123037. The reversal of 23311123020 is 2032111332.

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 = 23311122984 and 23311123002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 431137 + ... + 482183.

It is an arithmetic number, because the mean of its divisors is an integer number (510990480).

Almost surely, 2^23311123020 is an apocalyptic number.

23311123020 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 23311123020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36791314560).

23311123020 is an abundant number, since it is smaller than the sum of its proper divisors (50271506100).

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

23311123020 is a wasteful number, since it uses less digits than its factorization.

23311123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51164 (or 51159 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 23311123020 its reverse (2032111332), we get a palindrome (25343234352).

The spelling of 23311123020 in words is "twenty-three billion, three hundred eleven million, one hundred twenty-three thousand, twenty".