20329609 has 8 divisors (see below), whose sum is σ = 21346560. Its totient is φ = 19333776.

The previous prime is 20329597. The next prime is 20329649. The reversal of 20329609 is 90692302.

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 20329609 - 2⁵ = 20329577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20329649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3289 + ... + 7174.

It is an arithmetic number, because the mean of its divisors is an integer number (2668320).

Almost surely, 2^20329609 is an apocalyptic number.

20329609 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20329609 is a deficient number, since it is larger than the sum of its proper divisors (1016951).

20329609 is a wasteful number, since it uses less digits than its factorization.

20329609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10559.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20329609 is about 4508.8367679480. The cubic root of 20329609 is about 272.9248049733.

The spelling of 20329609 in words is "twenty million, three hundred twenty-nine thousand, six hundred nine".