20648479 has 4 divisors (see below), whose sum is σ = 21206584. Its totient is φ = 20090376.

The previous prime is 20648477. The next prime is 20648501. The reversal of 20648479 is 97484602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20648479 - 2¹ = 20648477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648477) 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 3 ways as a sum of consecutive naturals, for example, 278997 + ... + 279070.

It is an arithmetic number, because the mean of its divisors is an integer number (5301646).

Almost surely, 2^20648479 is an apocalyptic number.

20648479 is a deficient number, since it is larger than the sum of its proper divisors (558105).

20648479 is an equidigital number, since it uses as much as digits as its factorization.

20648479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558104.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 20648479 is about 4544.0597487269. The cubic root of 20648479 is about 274.3443510059.

The spelling of 20648479 in words is "twenty million, six hundred forty-eight thousand, four hundred seventy-nine".