20603666 has 8 divisors (see below), whose sum is σ = 31329084. Its totient is φ = 10160640.

The previous prime is 20603647. The next prime is 20603669. The reversal of 20603666 is 66630602.

It can be written as a sum of positive squares in 2 ways, for example, as 19175641 + 1428025 = 4379^2 + 1195^2 .

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

It is a super-2 number, since 2×20603666² = 849022105279112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20603669) by changing a digit.

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, 70415 + ... + 70706.

Almost surely, 2^20603666 is an apocalyptic number.

20603666 is a deficient number, since it is larger than the sum of its proper divisors (10725418).

20603666 is a wasteful number, since it uses less digits than its factorization.

20603666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141196.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 20603666 is about 4539.1261273509. The cubic root of 20603666 is about 274.1457391519.

The spelling of 20603666 in words is "twenty million, six hundred three thousand, six hundred sixty-six".