20332639 has 4 divisors (see below), whose sum is σ = 20677320. Its totient is φ = 19987960.

The previous prime is 20332633. The next prime is 20332643. The reversal of 20332639 is 93623302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93623302 = 2 ⋅46811651.

It is a cyclic number.

It is not a de Polignac number, because 20332639 - 2⁵ = 20332607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20332633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172252 + ... + 172369.

It is an arithmetic number, because the mean of its divisors is an integer number (5169330).

Almost surely, 2^20332639 is an apocalyptic number.

20332639 is a deficient number, since it is larger than the sum of its proper divisors (344681).

20332639 is an equidigital number, since it uses as much as digits as its factorization.

20332639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344680.

The product of its (nonzero) digits is 5832, while the sum is 28.

The square root of 20332639 is about 4509.1727622703. The cubic root of 20332639 is about 272.9383635400.

The spelling of 20332639 in words is "twenty million, three hundred thirty-two thousand, six hundred thirty-nine".