20112309 has 48 divisors (see below), whose sum is σ = 35717760. Its totient is φ = 10644480.

The previous prime is 20112277. The next prime is 20112319. The reversal of 20112309 is 90321102.

It is a happy number.

It is not a de Polignac number, because 20112309 - 2⁵ = 20112277 is a prime.

It is a super-2 number, since 2×20112309² = 809009946622962, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20112291 and 20112300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112319) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95214 + ... + 95424.

It is an arithmetic number, because the mean of its divisors is an integer number (744120).

Almost surely, 2^20112309 is an apocalyptic number.

It is an amenable number.

20112309 is a deficient number, since it is larger than the sum of its proper divisors (15605451).

20112309 is a wasteful number, since it uses less digits than its factorization.

20112309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 20112309 is about 4484.6749046057. The cubic root of 20112309 is about 271.9489027791.

The spelling of 20112309 in words is "twenty million, one hundred twelve thousand, three hundred nine".