20669631 has 8 divisors (see below), whose sum is σ = 27777024. Its totient is φ = 13671000.

The previous prime is 20669611. The next prime is 20669641. The reversal of 20669631 is 13696602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20669631 - 2⁹ = 20669119 is a prime.

It is a super-2 number, since 2×20669631² = 854467291352322, which contains 22 as substring.

It is a zygodrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 20669592 and 20669601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26745 + ... + 27506.

It is an arithmetic number, because the mean of its divisors is an integer number (3472128).

Almost surely, 2^20669631 is an apocalyptic number.

20669631 is a deficient number, since it is larger than the sum of its proper divisors (7107393).

20669631 is a wasteful number, since it uses less digits than its factorization.

20669631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54381.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20669631 is about 4546.3865871701. The cubic root of 20669631 is about 274.4379971507.

The spelling of 20669631 in words is "twenty million, six hundred sixty-nine thousand, six hundred thirty-one".