20660223 has 8 divisors (see below), whose sum is σ = 27587200. Its totient is φ = 13753368.

The previous prime is 20660203. The next prime is 20660231. The reversal of 20660223 is 32206602.

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

It is not a de Polignac number, because 20660223 - 2²¹ = 18563071 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 20660223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660203) 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, 2443 + ... + 6876.

It is an arithmetic number, because the mean of its divisors is an integer number (3448400).

Almost surely, 2^20660223 is an apocalyptic number.

20660223 is a deficient number, since it is larger than the sum of its proper divisors (6926977).

20660223 is an equidigital number, since it uses as much as digits as its factorization.

20660223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20660223 is about 4545.3518015661. The cubic root of 20660223 is about 274.3963530513.

Adding to 20660223 its reverse (32206602), we get a palindrome (52866825).

The spelling of 20660223 in words is "twenty million, six hundred sixty thousand, two hundred twenty-three".