20110509 has 6 divisors (see below), whose sum is σ = 29048526. Its totient is φ = 13407000.

The previous prime is 20110483. The next prime is 20110511. The reversal of 20110509 is 90501102.

It can be written as a sum of positive squares in only one way, i.e., 12981609 + 7128900 = 3603^2 + 2670^2 .

It is not a de Polignac number, because 20110509 - 2¹¹ = 20108461 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20110491 and 20110500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110589) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117242 + ... + 1117259.

It is an arithmetic number, because the mean of its divisors is an integer number (4841421).

Almost surely, 2^20110509 is an apocalyptic number.

It is an amenable number.

20110509 is a deficient number, since it is larger than the sum of its proper divisors (8938017).

20110509 is a wasteful number, since it uses less digits than its factorization.

20110509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234507 (or 2234504 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 20110509 is about 4484.4742166725. The cubic root of 20110509 is about 271.9407896276.

The spelling of 20110509 in words is "twenty million, one hundred ten thousand, five hundred nine".