22720506 has 8 divisors (see below), whose sum is σ = 45441024. Its totient is φ = 7573500.

The previous prime is 22720501. The next prime is 22720507. The reversal of 22720506 is 60502722.

It is a sphenic number, since it is the product of 3 distinct primes.

22720506 is an admirable number.

It is a Curzon number.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (22720501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1893370 + ... + 1893381.

It is an arithmetic number, because the mean of its divisors is an integer number (5680128).

Almost surely, 2^22720506 is an apocalyptic number.

22720506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

22720506 is a wasteful number, since it uses less digits than its factorization.

22720506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786756.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 22720506 is about 4766.6031930506. The cubic root of 22720506 is about 283.2300526297.

The spelling of 22720506 in words is "twenty-two million, seven hundred twenty thousand, five hundred six".