20332405 has 8 divisors (see below), whose sum is σ = 24454584. Its totient is φ = 16228800.

The previous prime is 20332397. The next prime is 20332409. The reversal of 20332405 is 50423302.

It can be written as a sum of positive squares in 4 ways, for example, as 1747684 + 18584721 = 1322^2 + 4311^2 .

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

It is not a de Polignac number, because 20332405 - 2³ = 20332397 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 (20332409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2106 + ... + 6715.

It is an arithmetic number, because the mean of its divisors is an integer number (3056823).

Almost surely, 2^20332405 is an apocalyptic number.

It is an amenable number.

20332405 is a deficient number, since it is larger than the sum of its proper divisors (4122179).

20332405 is an equidigital number, since it uses as much as digits as its factorization.

20332405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9287.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20332405 is about 4509.1468150860. The cubic root of 20332405 is about 272.9373164907.

Adding to 20332405 its reverse (50423302), we get a palindrome (70755707).

The spelling of 20332405 in words is "twenty million, three hundred thirty-two thousand, four hundred five".