22220813 has 2 divisors, whose sum is σ = 22220814. Its totient is φ = 22220812.

The previous prime is 22220791. The next prime is 22220851. The reversal of 22220813 is 31802222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20811844 + 1408969 = 4562^2 + 1187^2 .

It is a cyclic number.

It is not a de Polignac number, because 22220813 - 2²² = 18026509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22220113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110406 + 11110407.

It is an arithmetic number, because the mean of its divisors is an integer number (11110407).

Almost surely, 2^22220813 is an apocalyptic number.

It is an amenable number.

22220813 is a deficient number, since it is larger than the sum of its proper divisors (1).

22220813 is an equidigital number, since it uses as much as digits as its factorization.

22220813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 22220813 is about 4713.8957349521. The cubic root of 22220813 is about 281.1382787213.

The spelling of 22220813 in words is "twenty-two million, two hundred twenty thousand, eight hundred thirteen".