22291040 has 48 divisors (see below), whose sum is σ = 53125632. Its totient is φ = 8838144.

The previous prime is 22291039. The next prime is 22291051. The reversal of 22291040 is 4019222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 19772 + ... + 20868.

It is an arithmetic number, because the mean of its divisors is an integer number (1106784).

Almost surely, 2^22291040 is an apocalyptic number.

22291040 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 22291040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26562816).

22291040 is an abundant number, since it is smaller than the sum of its proper divisors (30834592).

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

22291040 is a wasteful number, since it uses less digits than its factorization.

22291040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239 (or 1231 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 22291040 is about 4721.3387931814. The cubic root of 22291040 is about 281.4341385101.

The spelling of 22291040 in words is "twenty-two million, two hundred ninety-one thousand, forty".