20648679 has 8 divisors (see below), whose sum is σ = 27604992. Its totient is φ = 13729080.

The previous prime is 20648647. The next prime is 20648699. The reversal of 20648679 is 97684602.

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

It is not a de Polignac number, because 20648679 - 2⁵ = 20648647 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20648679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7837 + ... + 10134.

It is an arithmetic number, because the mean of its divisors is an integer number (3450624).

Almost surely, 2^20648679 is an apocalyptic number.

20648679 is a deficient number, since it is larger than the sum of its proper divisors (6956313).

20648679 is a wasteful number, since it uses less digits than its factorization.

20648679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18357.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20648679 is about 4544.0817554265. The cubic root of 20648679 is about 274.3452367644.

The spelling of 20648679 in words is "twenty million, six hundred forty-eight thousand, six hundred seventy-nine".