22720073 has 2 divisors, whose sum is σ = 22720074. Its totient is φ = 22720072.

The previous prime is 22720037. The next prime is 22720091. The reversal of 22720073 is 37002722.

Together with previous prime (22720037) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 7912969 = 3848^2 + 2813^2 .

It is a cyclic number.

It is not a de Polignac number, because 22720073 - 2¹⁶ = 22654537 is a prime.

It is not a weakly prime, because it can be changed into another prime (22720013) 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 as a sum of consecutive naturals, namely, 11360036 + 11360037.

It is an arithmetic number, because the mean of its divisors is an integer number (11360037).

Almost surely, 2^22720073 is an apocalyptic number.

It is an amenable number.

22720073 is a deficient number, since it is larger than the sum of its proper divisors (1).

22720073 is an equidigital number, since it uses as much as digits as its factorization.

22720073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 22720073 is about 4766.5577726489. The cubic root of 22720073 is about 283.2282533829.

Adding to 22720073 its reverse (37002722), we get a palindrome (59722795).

The spelling of 22720073 in words is "twenty-two million, seven hundred twenty thousand, seventy-three".