22398720 has 144 divisors (see below), whose sum is σ = 75546240. Its totient is φ = 5640192.

The previous prime is 22398713. The next prime is 22398731. The reversal of 22398720 is 2789322.

It is a congruent number.

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, 72807 + ... + 73113.

Almost surely, 2^22398720 is an apocalyptic number.

22398720 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 22398720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37773120).

22398720 is an abundant number, since it is smaller than the sum of its proper divisors (53147520).

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

22398720 is a wasteful number, since it uses less digits than its factorization.

22398720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 22398720 is about 4732.7285998671. The cubic root of 22398720 is about 281.8865798099.

The spelling of 22398720 in words is "twenty-two million, three hundred ninety-eight thousand, seven hundred twenty".