20441661 has 4 divisors (see below), whose sum is σ = 27255552. Its totient is φ = 13627772.

The previous prime is 20441651. The next prime is 20441669. The reversal of 20441661 is 16614402.

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 20441661 - 2¹¹ = 20439613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20441669) 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, 3406941 + ... + 3406946.

It is an arithmetic number, because the mean of its divisors is an integer number (6813888).

Almost surely, 2^20441661 is an apocalyptic number.

It is an amenable number.

20441661 is a deficient number, since it is larger than the sum of its proper divisors (6813891).

20441661 is an equidigital number, since it uses as much as digits as its factorization.

20441661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813890.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20441661 is about 4521.2455142361. The cubic root of 20441661 is about 273.4253188653.

The spelling of 20441661 in words is "twenty million, four hundred forty-one thousand, six hundred sixty-one".