20733209 has 8 divisors (see below), whose sum is σ = 24335808. Its totient is φ = 17290800.

The previous prime is 20733197. The next prime is 20733221. The reversal of 20733209 is 90233702.

It is an interprime number because it is at equal distance from previous prime (20733197) and next prime (20733221).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20733209 - 2²⁴ = 3955993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20733259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39767 + ... + 40284.

It is an arithmetic number, because the mean of its divisors is an integer number (3041976).

Almost surely, 2^20733209 is an apocalyptic number.

It is an amenable number.

20733209 is a deficient number, since it is larger than the sum of its proper divisors (3602599).

20733209 is an equidigital number, since it uses as much as digits as its factorization.

20733209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80095.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 20733209 is about 4553.3733648802. The cubic root of 20733209 is about 274.7190916665.

The spelling of 20733209 in words is "twenty million, seven hundred thirty-three thousand, two hundred nine".