22503440 has 40 divisors (see below), whose sum is σ = 52847808. Its totient is φ = 8910720.

The previous prime is 22503433. The next prime is 22503457. The reversal of 22503440 is 4430522.

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 (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6875 + ... + 9605.

Almost surely, 2^22503440 is an apocalyptic number.

22503440 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 22503440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26423904).

22503440 is an abundant number, since it is smaller than the sum of its proper divisors (30344368).

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

22503440 is a wasteful number, since it uses less digits than its factorization.

22503440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847 (or 2841 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 22503440 is about 4743.7790842323. The cubic root of 22503440 is about 282.3251953264.

Adding to 22503440 its reverse (4430522), we get a palindrome (26933962).

The spelling of 22503440 in words is "twenty-two million, five hundred three thousand, four hundred forty".