20416631 has 4 divisors (see below), whose sum is σ = 21075264. Its totient is φ = 19758000.

The previous prime is 20416603. The next prime is 20416661. The reversal of 20416631 is 13661402.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20416631 is a prime.

It is a super-3 number, since 3×20416631³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20416597 and 20416606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20416661) 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, 329270 + ... + 329331.

It is an arithmetic number, because the mean of its divisors is an integer number (5268816).

Almost surely, 2^20416631 is an apocalyptic number.

20416631 is a deficient number, since it is larger than the sum of its proper divisors (658633).

20416631 is an equidigital number, since it uses as much as digits as its factorization.

20416631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658632.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20416631 is about 4518.4766238191. The cubic root of 20416631 is about 273.3136738124.

The spelling of 20416631 in words is "twenty million, four hundred sixteen thousand, six hundred thirty-one".