20320453 has 2 divisors, whose sum is σ = 20320454. Its totient is φ = 20320452.

The previous prime is 20320441. The next prime is 20320463. The reversal of 20320453 is 35402302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19775809 + 544644 = 4447^2 + 738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20320453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160226 + 10160227.

It is an arithmetic number, because the mean of its divisors is an integer number (10160227).

Almost surely, 2^20320453 is an apocalyptic number.

It is an amenable number.

20320453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320453 is an equidigital number, since it uses as much as digits as its factorization.

20320453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20320453 is about 4507.8213141162. The cubic root of 20320453 is about 272.8838257500.

Adding to 20320453 its reverse (35402302), we get a palindrome (55722755).

The spelling of 20320453 in words is "twenty million, three hundred twenty thousand, four hundred fifty-three".