22401520 has 40 divisors (see below), whose sum is σ = 52590384. Its totient is φ = 8873472.

The previous prime is 22401493. The next prime is 22401521. The reversal of 22401520 is 2510422.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 22401494 and 22401503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22401521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7252 + ... + 9868.

Almost surely, 2^22401520 is an apocalyptic number.

22401520 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 22401520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26295192).

22401520 is an abundant number, since it is smaller than the sum of its proper divisors (30188864).

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

22401520 is a wasteful number, since it uses less digits than its factorization.

22401520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737 (or 2731 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22401520 is about 4733.0244030641. The cubic root of 22401520 is about 281.8983252658.

Adding to 22401520 its reverse (2510422), we get a palindrome (24911942).

The spelling of 22401520 in words is "twenty-two million, four hundred one thousand, five hundred twenty".