22720717 has 4 divisors (see below), whose sum is σ = 23504220. Its totient is φ = 21937216.

The previous prime is 22720679. The next prime is 22720741. The reversal of 22720717 is 71702722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8964036 + 13756681 = 2994^2 + 3709^2 .

It is a cyclic number.

It is not a de Polignac number, because 22720717 - 2⁷ = 22720589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22720777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391708 + ... + 391765.

It is an arithmetic number, because the mean of its divisors is an integer number (5876055).

Almost surely, 2^22720717 is an apocalyptic number.

It is an amenable number.

22720717 is a deficient number, since it is larger than the sum of its proper divisors (783503).

22720717 is an equidigital number, since it uses as much as digits as its factorization.

22720717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783502.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 22720717 is about 4766.6253261611. The cubic root of 22720717 is about 283.2309293906.

The spelling of 22720717 in words is "twenty-two million, seven hundred twenty thousand, seven hundred seventeen".