20489611 has 2 divisors, whose sum is σ = 20489612. Its totient is φ = 20489610.

The previous prime is 20489597. The next prime is 20489617. The reversal of 20489611 is 11698402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20489611 - 2⁹ = 20489099 is a prime.

It is not a weakly prime, because it can be changed into another prime (20489617) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10244805 + 10244806.

It is an arithmetic number, because the mean of its divisors is an integer number (10244806).

Almost surely, 2^20489611 is an apocalyptic number.

20489611 is a deficient number, since it is larger than the sum of its proper divisors (1).

20489611 is an equidigital number, since it uses as much as digits as its factorization.

20489611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20489611 is about 4526.5451505536. The cubic root of 20489611 is about 273.6389431575.

The spelling of 20489611 in words is "twenty million, four hundred eighty-nine thousand, six hundred eleven".