20329865 has 4 divisors (see below), whose sum is σ = 24395844. Its totient is φ = 16263888.

The previous prime is 20329853. The next prime is 20329879. The reversal of 20329865 is 56892302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3984016 + 16345849 = 1996^2 + 4043^2 .

It is a cyclic number.

It is not a de Polignac number, because 20329865 - 2¹² = 20325769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032982 + ... + 2032991.

It is an arithmetic number, because the mean of its divisors is an integer number (6098961).

Almost surely, 2^20329865 is an apocalyptic number.

It is an amenable number.

20329865 is a deficient number, since it is larger than the sum of its proper divisors (4065979).

20329865 is an equidigital number, since it uses as much as digits as its factorization.

20329865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065978.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 20329865 is about 4508.8651565555. The cubic root of 20329865 is about 272.9259505676.

The spelling of 20329865 in words is "twenty million, three hundred twenty-nine thousand, eight hundred sixty-five".