22513240 has 16 divisors (see below), whose sum is σ = 50654880. Its totient is φ = 9005280.

The previous prime is 22513217. The next prime is 22513243. The reversal of 22513240 is 4231522.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22513243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281376 + ... + 281455.

It is an arithmetic number, because the mean of its divisors is an integer number (3165930).

Almost surely, 2^22513240 is an apocalyptic number.

22513240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22513240 is an abundant number, since it is smaller than the sum of its proper divisors (28141640).

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

22513240 is a wasteful number, since it uses less digits than its factorization.

22513240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562842 (or 562838 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 22513240 is about 4744.8119035426. The cubic root of 22513240 is about 282.3661725485.

Adding to 22513240 its reverse (4231522), we get a palindrome (26744762).

The spelling of 22513240 in words is "twenty-two million, five hundred thirteen thousand, two hundred forty".