20648109 has 8 divisors (see below), whose sum is σ = 28275040. Its totient is φ = 13393296.

The previous prime is 20648093. The next prime is 20648113. The reversal of 20648109 is 90184602.

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

It is not a de Polignac number, because 20648109 - 2⁴ = 20648093 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 (20648119) 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, 92899 + ... + 93120.

It is an arithmetic number, because the mean of its divisors is an integer number (3534380).

Almost surely, 2^20648109 is an apocalyptic number.

It is an amenable number.

20648109 is a deficient number, since it is larger than the sum of its proper divisors (7626931).

20648109 is a wasteful number, since it uses less digits than its factorization.

20648109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186059.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20648109 is about 4544.0190360517. The cubic root of 20648109 is about 274.3427123378.

The spelling of 20648109 in words is "twenty million, six hundred forty-eight thousand, one hundred nine".