20226989 has 2 divisors, whose sum is σ = 20226990. Its totient is φ = 20226988.

The previous prime is 20226971. The next prime is 20227003. The reversal of 20226989 is 98962202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15342889 + 4884100 = 3917^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 20226989 - 2²⁰ = 19178413 is a prime.

It is a super-2 number, since 2×20226989² = 818262168012242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20226919) 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, 10113494 + 10113495.

It is an arithmetic number, because the mean of its divisors is an integer number (10113495).

Almost surely, 2^20226989 is an apocalyptic number.

It is an amenable number.

20226989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20226989 is an equidigital number, since it uses as much as digits as its factorization.

20226989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20226989 is about 4497.4424954634. The cubic root of 20226989 is about 272.4648059365.

The spelling of 20226989 in words is "twenty million, two hundred twenty-six thousand, nine hundred eighty-nine".