20453603 has 2 divisors, whose sum is σ = 20453604. Its totient is φ = 20453602.

The previous prime is 20453599. The next prime is 20453623. The reversal of 20453603 is 30635402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20453603 - 2² = 20453599 is a prime.

It is not a weakly prime, because it can be changed into another prime (20453623) 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 as a sum of consecutive naturals, namely, 10226801 + 10226802.

It is an arithmetic number, because the mean of its divisors is an integer number (10226802).

Almost surely, 2^20453603 is an apocalyptic number.

20453603 is a deficient number, since it is larger than the sum of its proper divisors (1).

20453603 is an equidigital number, since it uses as much as digits as its factorization.

20453603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 20453603 is about 4522.5659751959. The cubic root of 20453603 is about 273.4785534420.

The spelling of 20453603 in words is "twenty million, four hundred fifty-three thousand, six hundred three".