20650109 has 4 divisors (see below), whose sum is σ = 20764380. Its totient is φ = 20535840.

The previous prime is 20650099. The next prime is 20650127. The reversal of 20650109 is 90105602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5866084 + 14784025 = 2422^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 20650109 - 2¹² = 20646013 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 (20650129) 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, 56864 + ... + 57225.

It is an arithmetic number, because the mean of its divisors is an integer number (5191095).

Almost surely, 2^20650109 is an apocalyptic number.

It is an amenable number.

20650109 is a deficient number, since it is larger than the sum of its proper divisors (114271).

20650109 is a wasteful number, since it uses less digits than its factorization.

20650109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114270.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20650109 is about 4544.2391002235. The cubic root of 20650109 is about 274.3515697705.

The spelling of 20650109 in words is "twenty million, six hundred fifty thousand, one hundred nine".