20660369 has 4 divisors (see below), whose sum is σ = 20670960. Its totient is φ = 20649780.

The previous prime is 20660347. The next prime is 20660377. The reversal of 20660369 is 96306602.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20660369 is a prime.

It is a super-2 number, since 2×20660369² = 853701694432322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20660329) 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, 1427 + ... + 6584.

It is an arithmetic number, because the mean of its divisors is an integer number (5167740).

Almost surely, 2^20660369 is an apocalyptic number.

It is an amenable number.

20660369 is a deficient number, since it is larger than the sum of its proper divisors (10591).

20660369 is an equidigital number, since it uses as much as digits as its factorization.

20660369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10590.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 20660369 is about 4545.3678619007. The cubic root of 20660369 is about 274.3969994104.

The spelling of 20660369 in words is "twenty million, six hundred sixty thousand, three hundred sixty-nine".