20013603 has 4 divisors (see below), whose sum is σ = 26684808. Its totient is φ = 13342400.

The previous prime is 20013589. The next prime is 20013613. The reversal of 20013603 is 30631002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20013603 - 2⁸ = 20013347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20013613) 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, 3335598 + ... + 3335603.

It is an arithmetic number, because the mean of its divisors is an integer number (6671202).

Almost surely, 2^20013603 is an apocalyptic number.

20013603 is a deficient number, since it is larger than the sum of its proper divisors (6671205).

20013603 is an equidigital number, since it uses as much as digits as its factorization.

20013603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6671204.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20013603 is about 4473.6565581189. The cubic root of 20013603 is about 271.5032880839.

Adding to 20013603 its reverse (30631002), we get a palindrome (50644605).

The spelling of 20013603 in words is "twenty million, thirteen thousand, six hundred three".