20848609 has 4 divisors (see below), whose sum is σ = 20858116. Its totient is φ = 20839104.

The previous prime is 20848577. The next prime is 20848621. The reversal of 20848609 is 90684802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13542400 + 7306209 = 3680^2 + 2703^2 .

It is a cyclic number.

It is not a de Polignac number, because 20848609 - 2⁵ = 20848577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20848109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (5214529).

Almost surely, 2^20848609 is an apocalyptic number.

It is an amenable number.

20848609 is a deficient number, since it is larger than the sum of its proper divisors (9507).

20848609 is an equidigital number, since it uses as much as digits as its factorization.

20848609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9506.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 20848609 is about 4566.0277046904. The cubic root of 20848609 is about 275.2278398308.

The spelling of 20848609 in words is "twenty million, eight hundred forty-eight thousand, six hundred nine".