20512003 has 4 divisors (see below), whose sum is σ = 20526040. Its totient is φ = 20497968.

The previous prime is 20511977. The next prime is 20512031. The reversal of 20512003 is 30021502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20512003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20512073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4533 + ... + 7846.

It is an arithmetic number, because the mean of its divisors is an integer number (5131510).

Almost surely, 2^20512003 is an apocalyptic number.

20512003 is a deficient number, since it is larger than the sum of its proper divisors (14037).

20512003 is a wasteful number, since it uses less digits than its factorization.

20512003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14036.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20512003 is about 4529.0178847075. The cubic root of 20512003 is about 273.7385886558.

Adding to 20512003 its reverse (30021502), we get a palindrome (50533505).

The spelling of 20512003 in words is "twenty million, five hundred twelve thousand, three".