20532289 has 2 divisors, whose sum is σ = 20532290. Its totient is φ = 20532288.

The previous prime is 20532271. The next prime is 20532301. The reversal of 20532289 is 98223502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17363889 + 3168400 = 4167^2 + 1780^2 .

It is a cyclic number.

It is not a de Polignac number, because 20532289 - 2¹⁷ = 20401217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20532289.

It is not a weakly prime, because it can be changed into another prime (20532269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266144 + 10266145.

It is an arithmetic number, because the mean of its divisors is an integer number (10266145).

Almost surely, 2^20532289 is an apocalyptic number.

It is an amenable number.

20532289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20532289 is an equidigital number, since it uses as much as digits as its factorization.

20532289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20532289 is about 4531.2568896499. The cubic root of 20532289 is about 273.8287997611.

The spelling of 20532289 in words is "twenty million, five hundred thirty-two thousand, two hundred eighty-nine".