20683603 has 6 divisors (see below), whose sum is σ = 21373332. Its totient is φ = 20015460.

The previous prime is 20683591. The next prime is 20683613. The reversal of 20683603 is 30638602.

It is not a de Polignac number, because 20683603 - 2¹⁷ = 20552531 is a prime.

It is a super-2 number, since 2×20683603² = 855622866123218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20683613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9801 + ... + 11722.

It is an arithmetic number, because the mean of its divisors is an integer number (3562222).

Almost surely, 2^20683603 is an apocalyptic number.

20683603 is a deficient number, since it is larger than the sum of its proper divisors (689729).

20683603 is an equidigital number, since it uses as much as digits as its factorization.

20683603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21585 (or 21554 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20683603 is about 4547.9229325045. The cubic root of 20683603 is about 274.4998202836.

It can be divided in two parts, 2068 and 3603, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 20683603 in words is "twenty million, six hundred eighty-three thousand, six hundred three".