20682909 has 12 divisors (see below), whose sum is σ = 32173596. Its totient is φ = 12727872.

The previous prime is 20682899. The next prime is 20682917. The reversal of 20682909 is 90928602.

It can be written as a sum of positive squares in 2 ways, for example, as 11410884 + 9272025 = 3378^2 + 3045^2 .

It is not a de Polignac number, because 20682909 - 2⁵ = 20682877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20682919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88272 + ... + 88505.

It is an arithmetic number, because the mean of its divisors is an integer number (2681133).

Almost surely, 2^20682909 is an apocalyptic number.

It is an amenable number.

20682909 is a deficient number, since it is larger than the sum of its proper divisors (11490687).

20682909 is a wasteful number, since it uses less digits than its factorization.

20682909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176796 (or 176793 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20682909 is about 4547.8466332980. The cubic root of 20682909 is about 274.4967501382.

The spelling of 20682909 in words is "twenty million, six hundred eighty-two thousand, nine hundred nine".