20322506 has 4 divisors (see below), whose sum is σ = 30483762. Its totient is φ = 10161252.

The previous prime is 20322503. The next prime is 20322521. The reversal of 20322506 is 60522302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60522302 = 2 ⋅30261151.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 3389281 = 4115^2 + 1841^2 .

It is not an unprimeable number, because it can be changed into a prime (20322503) 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 as a sum of consecutive naturals, namely, 5080625 + ... + 5080628.

Almost surely, 2^20322506 is an apocalyptic number.

20322506 is a deficient number, since it is larger than the sum of its proper divisors (10161256).

20322506 is a wasteful number, since it uses less digits than its factorization.

20322506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10161255.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20322506 is about 4508.0490236908. The cubic root of 20322506 is about 272.8930153685.

Adding to 20322506 its reverse (60522302), we get a palindrome (80844808).

The spelling of 20322506 in words is "twenty million, three hundred twenty-two thousand, five hundred six".