20495603 has 4 divisors (see below), whose sum is σ = 20586120. Its totient is φ = 20405088.

The previous prime is 20495581. The next prime is 20495609. The reversal of 20495603 is 30659402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30659402 = 2 ⋅15329701.

It is a cyclic number.

It is not a de Polignac number, because 20495603 - 2⁶ = 20495539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20495609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44918 + ... + 45371.

It is an arithmetic number, because the mean of its divisors is an integer number (5146530).

Almost surely, 2^20495603 is an apocalyptic number.

20495603 is a deficient number, since it is larger than the sum of its proper divisors (90517).

20495603 is an equidigital number, since it uses as much as digits as its factorization.

20495603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90516.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20495603 is about 4527.2069756087. The cubic root of 20495603 is about 273.6656149627.

The spelling of 20495603 in words is "twenty million, four hundred ninety-five thousand, six hundred three".