20663441 has 4 divisors (see below), whose sum is σ = 20761584. Its totient is φ = 20565300.

The previous prime is 20663437. The next prime is 20663471. The reversal of 20663441 is 14436602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20663441 - 2² = 20663437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20663441.

It is not an unprimeable number, because it can be changed into a prime (20663471) 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, 48755 + ... + 49176.

It is an arithmetic number, because the mean of its divisors is an integer number (5190396).

Almost surely, 2^20663441 is an apocalyptic number.

It is an amenable number.

20663441 is a deficient number, since it is larger than the sum of its proper divisors (98143).

20663441 is an equidigital number, since it uses as much as digits as its factorization.

20663441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98142.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20663441 is about 4545.7057757844. The cubic root of 20663441 is about 274.4105988095.

The spelling of 20663441 in words is "twenty million, six hundred sixty-three thousand, four hundred forty-one".