20489587 has 2 divisors, whose sum is σ = 20489588. Its totient is φ = 20489586.

The previous prime is 20489569. The next prime is 20489597. The reversal of 20489587 is 78598402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20489587 - 2¹⁹ = 19965299 is a prime.

It is not a weakly prime, because it can be changed into another prime (20489507) 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, 10244793 + 10244794.

It is an arithmetic number, because the mean of its divisors is an integer number (10244794).

Almost surely, 2^20489587 is an apocalyptic number.

20489587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20489587 is an equidigital number, since it uses as much as digits as its factorization.

20489587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 20489587 is about 4526.5424995243. The cubic root of 20489587 is about 273.6388363173.

The spelling of 20489587 in words is "twenty million, four hundred eighty-nine thousand, five hundred eighty-seven".