20113631 has 4 divisors (see below), whose sum is σ = 20454600. Its totient is φ = 19772664.

The previous prime is 20113627. The next prime is 20113633. The reversal of 20113631 is 13631102.

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 20113631 - 2² = 20113627 is a prime.

It is a super-2 number, since 2×20113631² = 809116304008322, 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 (20113633) 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, 170396 + ... + 170513.

It is an arithmetic number, because the mean of its divisors is an integer number (5113650).

Almost surely, 2^20113631 is an apocalyptic number.

20113631 is a deficient number, since it is larger than the sum of its proper divisors (340969).

20113631 is an equidigital number, since it uses as much as digits as its factorization.

20113631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340968.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 20113631 is about 4484.8222930234. The cubic root of 20113631 is about 271.9548611298.

Adding to 20113631 its reverse (13631102), we get a palindrome (33744733).

The spelling of 20113631 in words is "twenty million, one hundred thirteen thousand, six hundred thirty-one".