20322493 has 4 divisors (see below), whose sum is σ = 20409948. Its totient is φ = 20235040.

The previous prime is 20322487. The next prime is 20322503. The reversal of 20322493 is 39422302.

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 13860729 + 6461764 = 3723^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 20322493 - 2⁹ = 20321981 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 (20322433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43378 + ... + 43843.

It is an arithmetic number, because the mean of its divisors is an integer number (5102487).

Almost surely, 2^20322493 is an apocalyptic number.

It is an amenable number.

20322493 is a deficient number, since it is larger than the sum of its proper divisors (87455).

20322493 is an equidigital number, since it uses as much as digits as its factorization.

20322493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87454.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20322493 is about 4508.0475818252. The cubic root of 20322493 is about 272.8929571799.

Adding to 20322493 its reverse (39422302), we get a palindrome (59744795).

The spelling of 20322493 in words is "twenty million, three hundred twenty-two thousand, four hundred ninety-three".