20103211 has 4 divisors (see below), whose sum is σ = 20261632. Its totient is φ = 19944792.

The previous prime is 20103203. The next prime is 20103241. The reversal of 20103211 is 11230102.

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

It is a cyclic number.

It is not a de Polignac number, because 20103211 - 2³ = 20103203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20103241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79020 + ... + 79273.

It is an arithmetic number, because the mean of its divisors is an integer number (5065408).

Almost surely, 2^20103211 is an apocalyptic number.

20103211 is a deficient number, since it is larger than the sum of its proper divisors (158421).

20103211 is a wasteful number, since it uses less digits than its factorization.

20103211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158420.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20103211 is about 4483.6604465548. The cubic root of 20103211 is about 271.9078903442.

Adding to 20103211 its reverse (11230102), we get a palindrome (31333313).

The spelling of 20103211 in words is "twenty million, one hundred three thousand, two hundred eleven".