20307473 has 4 divisors (see below), whose sum is σ = 20340288. Its totient is φ = 20274660.

The previous prime is 20307467. The next prime is 20307509. The reversal of 20307473 is 37470302.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37470302 = 2 ⋅18735151.

It is a cyclic number.

It is not a de Polignac number, because 20307473 - 2⁴ = 20307457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20307403) 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, 15461 + ... + 16722.

It is an arithmetic number, because the mean of its divisors is an integer number (5085072).

Almost surely, 2^20307473 is an apocalyptic number.

It is an amenable number.

20307473 is a deficient number, since it is larger than the sum of its proper divisors (32815).

20307473 is an equidigital number, since it uses as much as digits as its factorization.

20307473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32814.

The product of its (nonzero) digits is 3528, while the sum is 26.

The square root of 20307473 is about 4506.3813642434. The cubic root of 20307473 is about 272.8257104691.

Adding to 20307473 its reverse (37470302), we get a palindrome (57777775).

The spelling of 20307473 in words is "twenty million, three hundred seven thousand, four hundred seventy-three".