20003113 has 4 divisors (see below), whose sum is σ = 21541828. Its totient is φ = 18464400.

The previous prime is 20003107. The next prime is 20003117. The reversal of 20003113 is 31130002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31130002 = 2 ⋅15565001.

It can be written as a sum of positive squares in 2 ways, for example, as 6985449 + 13017664 = 2643^2 + 3608^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20003113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20003113.

It is not an unprimeable number, because it can be changed into a prime (20003117) 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 3 ways as a sum of consecutive naturals, for example, 769338 + ... + 769363.

It is an arithmetic number, because the mean of its divisors is an integer number (5385457).

Almost surely, 2^20003113 is an apocalyptic number.

It is an amenable number.

20003113 is a deficient number, since it is larger than the sum of its proper divisors (1538715).

20003113 is a wasteful number, since it uses less digits than its factorization.

20003113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538714.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 20003113 is about 4472.4839854381. The cubic root of 20003113 is about 271.4558442323.

Adding to 20003113 its reverse (31130002), we get a palindrome (51133115).

The spelling of 20003113 in words is "twenty million, three thousand, one hundred thirteen".