20329209 has 12 divisors (see below), whose sum is σ = 29530800. Its totient is φ = 13476024.

The previous prime is 20329201. The next prime is 20329237. The reversal of 20329209 is 90292302.

It is not a de Polignac number, because 20329209 - 2³ = 20329201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20329201) 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, 4699 + ... + 7920.

It is an arithmetic number, because the mean of its divisors is an integer number (2460900).

Almost surely, 2^20329209 is an apocalyptic number.

It is an amenable number.

20329209 is a deficient number, since it is larger than the sum of its proper divisors (9201591).

20329209 is a wasteful number, since it uses less digits than its factorization.

20329209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804 (or 12801 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20329209 is about 4508.7924103911. The cubic root of 20329209 is about 272.9230149628.

The spelling of 20329209 in words is "twenty million, three hundred twenty-nine thousand, two hundred nine".