20530386 has 12 divisors (see below), whose sum is σ = 44482542. Its totient is φ = 6843456.

The previous prime is 20530351. The next prime is 20530397. The reversal of 20530386 is 68303502.

It can be written as a sum of positive squares in only one way, i.e., 20385225 + 145161 = 4515^2 + 381^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 570271 + ... + 570306.

Almost surely, 2^20530386 is an apocalyptic number.

20530386 is an abundant number, since it is smaller than the sum of its proper divisors (23952156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20530386 is a wasteful number, since it uses less digits than its factorization.

20530386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140585 (or 1140582 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20530386 is about 4531.0468988965. The cubic root of 20530386 is about 273.8203397155.

Adding to 20530386 its reverse (68303502), we get a palindrome (88833888).

The spelling of 20530386 in words is "twenty million, five hundred thirty thousand, three hundred eighty-six".