22497440 has 96 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 7547904.

The previous prime is 22497437. The next prime is 22497457. The reversal of 22497440 is 4479422.

It is a super-2 number, since 2×22497440² = 1012269613107200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 22497397 and 22497406.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59171 + ... + 59549.

It is an arithmetic number, because the mean of its divisors is an integer number (646380).

Almost surely, 2^22497440 is an apocalyptic number.

22497440 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 22497440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31026240).

22497440 is an abundant number, since it is smaller than the sum of its proper divisors (39555040).

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

22497440 is a wasteful number, since it uses less digits than its factorization.

22497440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 22497440 is about 4743.1466348828. The cubic root of 22497440 is about 282.3001013594.

The spelling of 22497440 in words is "twenty-two million, four hundred ninety-seven thousand, four hundred forty".