20103631 has 4 divisors (see below), whose sum is σ = 20114352. Its totient is φ = 20092912.

The previous prime is 20103619. The next prime is 20103637. The reversal of 20103631 is 13630102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13630102 = 2 ⋅6815051.

It is a cyclic number.

It is not a de Polignac number, because 20103631 - 2⁵ = 20103599 is a prime.

It is a super-2 number, since 2×20103631² = 808311958768322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103637) 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 3 ways as a sum of consecutive naturals, for example, 1726 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (5028588).

Almost surely, 2^20103631 is an apocalyptic number.

20103631 is a deficient number, since it is larger than the sum of its proper divisors (10721).

20103631 is an equidigital number, since it uses as much as digits as its factorization.

20103631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10720.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20103631 is about 4483.7072830416. The cubic root of 20103631 is about 271.9097839143.

Adding to 20103631 its reverse (13630102), we get a palindrome (33733733).

The spelling of 20103631 in words is "twenty million, one hundred three thousand, six hundred thirty-one".