23111220420 has 72 divisors (see below), whose sum is σ = 70232495424. Its totient is φ = 6151699008.

The previous prime is 23111220403. The next prime is 23111220421. The reversal of 23111220420 is 2402211132.

It is a happy number.

23111220420 is a `hidden beast` number, since 23 + 1 + 1 + 1 + 220 + 420 = 666.

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 = 23111220393 and 23111220402.

It is not an unprimeable number, because it can be changed into a prime (23111220421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18904 + ... + 215823.

Almost surely, 2^23111220420 is an apocalyptic number.

23111220420 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 23111220420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35116247712).

23111220420 is an abundant number, since it is smaller than the sum of its proper divisors (47121275004).

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

23111220420 is a wasteful number, since it uses less digits than its factorization.

23111220420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235289 (or 235284 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 23111220420 its reverse (2402211132), we get a palindrome (25513431552).

The spelling of 23111220420 in words is "twenty-three billion, one hundred eleven million, two hundred twenty thousand, four hundred twenty".