22299840 has 224 divisors, whose sum is σ = 82296000. Its totient is φ = 5677056.

The previous prime is 22299839. The next prime is 22299847. The reversal of 22299840 is 4899222.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22299795 and 22299804.

It is not an unprimeable number, because it can be changed into a prime (22299847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 250516 + ... + 250604.

Almost surely, 2^22299840 is an apocalyptic number.

22299840 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 22299840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41148000).

22299840 is an abundant number, since it is smaller than the sum of its proper divisors (59996160).

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

22299840 is a wasteful number, since it uses less digits than its factorization.

22299840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 22299840 is about 4722.2706402747. The cubic root of 22299840 is about 281.4711682552.

The spelling of 22299840 in words is "twenty-two million, two hundred ninety-nine thousand, eight hundred forty".