20065603 has 8 divisors (see below), whose sum is σ = 20356272. Its totient is φ = 19777056.

The previous prime is 20065597. The next prime is 20065607. The reversal of 20065603 is 30656002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20065603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20065607) 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 7 ways as a sum of consecutive naturals, for example, 29301 + ... + 29977.

It is an arithmetic number, because the mean of its divisors is an integer number (2544534).

Almost surely, 2^20065603 is an apocalyptic number.

20065603 is a deficient number, since it is larger than the sum of its proper divisors (290669).

20065603 is a wasteful number, since it uses less digits than its factorization.

20065603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20065603 is about 4479.4645885418. The cubic root of 20065603 is about 271.7382276426.

The spelling of 20065603 in words is "twenty million, sixty-five thousand, six hundred three".