22403240 has 16 divisors (see below), whose sum is σ = 50407380. Its totient is φ = 8961280.

The previous prime is 22403239. The next prime is 22403279. The reversal of 22403240 is 4230422.

It can be written as a sum of positive squares in 2 ways, for example, as 20666116 + 1737124 = 4546^2 + 1318^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280001 + ... + 280080.

Almost surely, 2^22403240 is an apocalyptic number.

22403240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22403240 is an abundant number, since it is smaller than the sum of its proper divisors (28004140).

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

22403240 is a wasteful number, since it uses less digits than its factorization.

22403240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560092 (or 560088 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 22403240 is about 4733.2061015764. The cubic root of 22403240 is about 281.9055398463.

Adding to 22403240 its reverse (4230422), we get a palindrome (26633662).

The spelling of 22403240 in words is "twenty-two million, four hundred three thousand, two hundred forty".