20100003 has 16 divisors (see below), whose sum is σ = 33413376. Its totient is φ = 10441440.

The previous prime is 20099983. The next prime is 20100023. The reversal of 20100003 is 30000102.

It is an interprime number because it is at equal distance from previous prime (20099983) and next prime (20100023).

It is not a de Polignac number, because 20100003 - 2⁶ = 20099939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20099964 and 20100000.

It is not an unprimeable number, because it can be changed into a prime (20100023) 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 15 ways as a sum of consecutive naturals, for example, 43276 + ... + 43737.

It is an arithmetic number, because the mean of its divisors is an integer number (2088336).

Almost surely, 2^20100003 is an apocalyptic number.

20100003 is a deficient number, since it is larger than the sum of its proper divisors (13313373).

20100003 is a wasteful number, since it uses less digits than its factorization.

20100003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87034.

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

The square root of 20100003 is about 4483.3026888668. The cubic root of 20100003 is about 271.8934262052.

Adding to 20100003 its reverse (30000102), we get a palindrome (50100105).

Subtracting 20100003 from its reverse (30000102), we obtain a palindrome (9900099).

The spelling of 20100003 in words is "twenty million, one hundred thousand, three".