20104631 has 4 divisors (see below), whose sum is σ = 20359200. Its totient is φ = 19850064.

The previous prime is 20104619. The next prime is 20104639. The reversal of 20104631 is 13640102.

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 20104631 - 2¹⁰ = 20103607 is a prime.

It is a super-2 number, since 2×20104631² = 808392375292322, 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 (20104639) 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, 127166 + ... + 127323.

It is an arithmetic number, because the mean of its divisors is an integer number (5089800).

Almost surely, 2^20104631 is an apocalyptic number.

20104631 is a deficient number, since it is larger than the sum of its proper divisors (254569).

20104631 is an equidigital number, since it uses as much as digits as its factorization.

20104631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254568.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20104631 is about 4483.8187965171. The cubic root of 20104631 is about 271.9142923085.

Adding to 20104631 its reverse (13640102), we get a palindrome (33744733).

The spelling of 20104631 in words is "twenty million, one hundred four thousand, six hundred thirty-one".