20530366 has 4 divisors (see below), whose sum is σ = 30795552. Its totient is φ = 10265182.

The previous prime is 20530351. The next prime is 20530397. The reversal of 20530366 is 66303502.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20530366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5132590 + ... + 5132593.

It is an arithmetic number, because the mean of its divisors is an integer number (7698888).

Almost surely, 2^20530366 is an apocalyptic number.

20530366 is a deficient number, since it is larger than the sum of its proper divisors (10265186).

20530366 is a wasteful number, since it uses less digits than its factorization.

20530366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10265185.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 20530366 is about 4531.0446919005. The cubic root of 20530366 is about 273.8202508000.

Adding to 20530366 its reverse (66303502), we get a palindrome (86833868).

The spelling of 20530366 in words is "twenty million, five hundred thirty thousand, three hundred sixty-six".