20663072 has 24 divisors (see below), whose sum is σ = 40781916. Its totient is φ = 10305792.

The previous prime is 20663053. The next prime is 20663087. The reversal of 20663072 is 27036602.

It can be written as a sum of positive squares in 2 ways, for example, as 19749136 + 913936 = 4444^2 + 956^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23798 + ... + 24650.

Almost surely, 2^20663072 is an apocalyptic number.

It is an amenable number.

20663072 is a deficient number, since it is larger than the sum of its proper divisors (20118844).

20663072 is an equidigital number, since it uses as much as digits as its factorization.

20663072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620 (or 1612 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 20663072 is about 4545.6651878465. The cubic root of 20663072 is about 274.4089653591.

Adding to 20663072 its reverse (27036602), we get a palindrome (47699674).

The spelling of 20663072 in words is "twenty million, six hundred sixty-three thousand, seventy-two".