22320917 has 2 divisors, whose sum is σ = 22320918. Its totient is φ = 22320916.

The previous prime is 22320901. The next prime is 22320919. The reversal of 22320917 is 71902322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13476241 + 8844676 = 3671^2 + 2974^2 .

It is a cyclic number.

It is not a de Polignac number, because 22320917 - 2⁴ = 22320901 is a prime.

It is a super-3 number, since 3×22320917³ (a number of 23 digits) contains 333 as substring.

Together with 22320919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22320919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11160458 + 11160459.

It is an arithmetic number, because the mean of its divisors is an integer number (11160459).

Almost surely, 2^22320917 is an apocalyptic number.

It is an amenable number.

22320917 is a deficient number, since it is larger than the sum of its proper divisors (1).

22320917 is an equidigital number, since it uses as much as digits as its factorization.

22320917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 22320917 is about 4724.5017726740. The cubic root of 22320917 is about 281.5598191112.

The spelling of 22320917 in words is "twenty-two million, three hundred twenty thousand, nine hundred seventeen".