20648659 has 8 divisors (see below), whose sum is σ = 21908880. Its totient is φ = 19393536.

The previous prime is 20648647. The next prime is 20648699. The reversal of 20648659 is 95684602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20648659 - 2⁷ = 20648531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20648699) 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 in 7 ways as a sum of consecutive naturals, for example, 9987 + ... + 11875.

It is an arithmetic number, because the mean of its divisors is an integer number (2738610).

Almost surely, 2^20648659 is an apocalyptic number.

20648659 is a deficient number, since it is larger than the sum of its proper divisors (1260221).

20648659 is a wasteful number, since it uses less digits than its factorization.

20648659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 20648659 is about 4544.0795547613. The cubic root of 20648659 is about 274.3451481888.

The spelling of 20648659 in words is "twenty million, six hundred forty-eight thousand, six hundred fifty-nine".