20021103 has 6 divisors (see below), whose sum is σ = 28919384. Its totient is φ = 13347396.

The previous prime is 20021093. The next prime is 20021137. The reversal of 20021103 is 30112002.

It is a happy number.

It is not a de Polignac number, because 20021103 - 2²² = 15826799 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2224567 = 20021103 / (2 + 0 + 0 + 2 + 1 + 1 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112275 + ... + 1112292.

Almost surely, 2^20021103 is an apocalyptic number.

20021103 is a deficient number, since it is larger than the sum of its proper divisors (8898281).

20021103 is a wasteful number, since it uses less digits than its factorization.

20021103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224573 (or 2224570 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20021103 is about 4474.4947200773. The cubic root of 20021103 is about 271.5371986922.

Adding to 20021103 its reverse (30112002), we get a palindrome (50133105).

The spelling of 20021103 in words is "twenty million, twenty-one thousand, one hundred three".