20330505 has 48 divisors (see below), whose sum is σ = 39626496. Its totient is φ = 9567360.

The previous prime is 20330503. The next prime is 20330509. The reversal of 20330505 is 50503302.

It is not a de Polignac number, because 20330505 - 2¹ = 20330503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20330503) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12700 + ... + 14210.

It is an arithmetic number, because the mean of its divisors is an integer number (825552).

Almost surely, 2^20330505 is an apocalyptic number.

It is an amenable number.

20330505 is a deficient number, since it is larger than the sum of its proper divisors (19295991).

20330505 is a wasteful number, since it uses less digits than its factorization.

20330505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558 (or 1555 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 18.

The square root of 20330505 is about 4508.9361272921. The cubic root of 20330505 is about 272.9288145115.

Adding to 20330505 its reverse (50503302), we get a palindrome (70833807).

The spelling of 20330505 in words is "twenty million, three hundred thirty thousand, five hundred five".