20903089 has 2 divisors, whose sum is σ = 20903090. Its totient is φ = 20903088.

The previous prime is 20903027. The next prime is 20903101. The reversal of 20903089 is 98030902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12723489 + 8179600 = 3567^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 20903089 - 2⁹ = 20902577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20903089.

It is not a weakly prime, because it can be changed into another prime (20903009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451544 + 10451545.

It is an arithmetic number, because the mean of its divisors is an integer number (10451545).

Almost surely, 2^20903089 is an apocalyptic number.

It is an amenable number.

20903089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20903089 is an equidigital number, since it uses as much as digits as its factorization.

20903089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20903089 is about 4571.9896106619. The cubic root of 20903089 is about 275.4673661366.

The spelling of 20903089 in words is "twenty million, nine hundred three thousand, eighty-nine".