20669056 has 32 divisors (see below), whose sum is σ = 41570100. Its totient is φ = 10235904.

The previous prime is 20669041. The next prime is 20669063. The reversal of 20669056 is 65096602.

It can be written as a sum of positive squares in 2 ways, for example, as 14318656 + 6350400 = 3784^2 + 2520^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×20669056² = 854419751862272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13750 + ... + 15178.

Almost surely, 2^20669056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20669056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20785050).

20669056 is an abundant number, since it is smaller than the sum of its proper divisors (20901044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20669056 is a wasteful number, since it uses less digits than its factorization.

20669056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556 (or 1544 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20669056 is about 4546.3233496970. The cubic root of 20669056 is about 274.4354523010.

The spelling of 20669056 in words is "twenty million, six hundred sixty-nine thousand, fifty-six".