20320473 has 4 divisors (see below), whose sum is σ = 27093968. Its totient is φ = 13546980.

The previous prime is 20320463. The next prime is 20320483. The reversal of 20320473 is 37402302.

It is a happy number.

20320473 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20320463) and next prime (20320483).

It is not a de Polignac number, because 20320473 - 2⁵ = 20320441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320453) 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 in 3 ways as a sum of consecutive naturals, for example, 3386743 + ... + 3386748.

It is an arithmetic number, because the mean of its divisors is an integer number (6773492).

Almost surely, 2^20320473 is an apocalyptic number.

It is an amenable number.

20320473 is a deficient number, since it is larger than the sum of its proper divisors (6773495).

20320473 is an equidigital number, since it uses as much as digits as its factorization.

20320473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773494.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 20320473 is about 4507.8235324822. The cubic root of 20320473 is about 272.8839152768.

Adding to 20320473 its reverse (37402302), we get a palindrome (57722775).

The spelling of 20320473 in words is "twenty million, three hundred twenty thousand, four hundred seventy-three".