20530236 has 12 divisors (see below), whose sum is σ = 47903912. Its totient is φ = 6843408.

The previous prime is 20530229. The next prime is 20530247. The reversal of 20530236 is 63203502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 855415 + ... + 855438.

Almost surely, 2^20530236 is an apocalyptic number.

It is an amenable number.

20530236 is an abundant number, since it is smaller than the sum of its proper divisors (27373676).

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

20530236 is a wasteful number, since it uses less digits than its factorization.

20530236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710860 (or 1710858 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20530236 is about 4531.0303464003. The cubic root of 20530236 is about 273.8196728478.

Adding to 20530236 its reverse (63203502), we get a palindrome (83733738).

The spelling of 20530236 in words is "twenty million, five hundred thirty thousand, two hundred thirty-six".