20001003 has 8 divisors (see below), whose sum is σ = 29092416. Its totient is φ = 12121800.

The previous prime is 20001001. The next prime is 20001019. The reversal of 20001003 is 30010002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20001003 - 2¹ = 20001001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20000982 and 20001000.

It is not an unprimeable number, because it can be changed into a prime (20001001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303013 + ... + 303078.

It is an arithmetic number, because the mean of its divisors is an integer number (3636552).

Almost surely, 2^20001003 is an apocalyptic number.

20001003 is a deficient number, since it is larger than the sum of its proper divisors (9091413).

20001003 is a wasteful number, since it uses less digits than its factorization.

20001003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606105.

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 20001003 is about 4472.2480924027. The cubic root of 20001003 is about 271.4462991851.

Adding to 20001003 its reverse (30010002), we get a palindrome (50011005).

It can be divided in two parts, 2000 and 1003, that added together give a palindrome (3003).

The spelling of 20001003 in words is "twenty million, one thousand, three".