20103111 has 12 divisors (see below), whose sum is σ = 33186192. Its totient is φ = 11487456.

The previous prime is 20103107. The next prime is 20103113. The reversal of 20103111 is 11130102.

It is not a de Polignac number, because 20103111 - 2² = 20103107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20103093 and 20103102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159486 + ... + 159611.

It is an arithmetic number, because the mean of its divisors is an integer number (2765516).

Almost surely, 2^20103111 is an apocalyptic number.

20103111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20103111 is a deficient number, since it is larger than the sum of its proper divisors (13083081).

20103111 is a wasteful number, since it uses less digits than its factorization.

20103111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319110 (or 319107 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 20103111 is about 4483.6492949382. The cubic root of 20103111 is about 271.9074394903.

Adding to 20103111 its reverse (11130102), we get a palindrome (31233213).

The spelling of 20103111 in words is "twenty million, one hundred three thousand, one hundred eleven".