20451373 has 2 divisors, whose sum is σ = 20451374. Its totient is φ = 20451372.

The previous prime is 20451329. The next prime is 20451397. The reversal of 20451373 is 37315402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19245769 + 1205604 = 4387^2 + 1098^2 .

It is a cyclic number.

It is not a de Polignac number, because 20451373 - 2⁹ = 20450861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225686 + 10225687.

It is an arithmetic number, because the mean of its divisors is an integer number (10225687).

Almost surely, 2^20451373 is an apocalyptic number.

It is an amenable number.

20451373 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451373 is an equidigital number, since it uses as much as digits as its factorization.

20451373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20451373 is about 4522.3194270197. The cubic root of 20451373 is about 273.4686142096.

Adding to 20451373 its reverse (37315402), we get a palindrome (57766775).

The spelling of 20451373 in words is "twenty million, four hundred fifty-one thousand, three hundred seventy-three".