22721760 has 144 divisors (see below), whose sum is σ = 80196480. Its totient is φ = 5852160.

The previous prime is 22721747. The next prime is 22721767. The reversal of 22721760 is 6712722.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22721767) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44386 + ... + 44894.

It is an arithmetic number, because the mean of its divisors is an integer number (556920).

Almost surely, 2^22721760 is an apocalyptic number.

22721760 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 22721760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40098240).

22721760 is an abundant number, since it is smaller than the sum of its proper divisors (57474720).

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

22721760 is a wasteful number, since it uses less digits than its factorization.

22721760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 22721760 is about 4766.7347314488. The cubic root of 22721760 is about 283.2352632523.

The spelling of 22721760 in words is "twenty-two million, seven hundred twenty-one thousand, seven hundred sixty".