20623289 has 2 divisors, whose sum is σ = 20623290. Its totient is φ = 20623288.

The previous prime is 20623283. The next prime is 20623297. The reversal of 20623289 is 98232602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15936064 + 4687225 = 3992^2 + 2165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20623289 is a prime.

It is not a weakly prime, because it can be changed into another prime (20623283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311644 + 10311645.

It is an arithmetic number, because the mean of its divisors is an integer number (10311645).

Almost surely, 2^20623289 is an apocalyptic number.

It is an amenable number.

20623289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623289 is an equidigital number, since it uses as much as digits as its factorization.

20623289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20623289 is about 4541.2871523391. The cubic root of 20623289 is about 274.2327439743.

The spelling of 20623289 in words is "twenty million, six hundred twenty-three thousand, two hundred eighty-nine".