23220403440 has 160 divisors (see below), whose sum is σ = 78834954240. Its totient is φ = 5618869248.

The previous prime is 23220403433. The next prime is 23220403447. The reversal of 23220403440 is 4430402232.

It is an interprime number because it is at equal distance from previous prime (23220403433) and next prime (23220403447).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 23220403440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23220403447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121009 + ... + 247151.

It is an arithmetic number, because the mean of its divisors is an integer number (492718464).

Almost surely, 2^23220403440 is an apocalyptic number.

23220403440 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 23220403440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39417477120).

23220403440 is an abundant number, since it is smaller than the sum of its proper divisors (55614550800).

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

23220403440 is a wasteful number, since it uses less digits than its factorization.

23220403440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126231 (or 126225 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

Adding to 23220403440 its reverse (4430402232), we get a palindrome (27650805672).

The spelling of 23220403440 in words is "twenty-three billion, two hundred twenty million, four hundred three thousand, four hundred forty".