20476609 has 2 divisors, whose sum is σ = 20476610. Its totient is φ = 20476608.

The previous prime is 20476597. The next prime is 20476637. The reversal of 20476609 is 90667402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15186609 + 5290000 = 3897^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 20476609 - 2¹⁹ = 19952321 is a prime.

It is a super-2 number, since 2×20476609² = 838583032277762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20476649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10238304 + 10238305.

It is an arithmetic number, because the mean of its divisors is an integer number (10238305).

Almost surely, 2^20476609 is an apocalyptic number.

It is an amenable number.

20476609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20476609 is an equidigital number, since it uses as much as digits as its factorization.

20476609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20476609 is about 4525.1087279755. The cubic root of 20476609 is about 273.5810503003.

The spelling of 20476609 in words is "twenty million, four hundred seventy-six thousand, six hundred nine".