20530312 has 48 divisors (see below), whose sum is σ = 42900480. Its totient is φ = 9203040.

The previous prime is 20530309. The next prime is 20530313. The reversal of 20530312 is 21303502.

It is not an unprimeable number, because it can be changed into a prime (20530313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122853 + ... + 123019.

It is an arithmetic number, because the mean of its divisors is an integer number (893760).

Almost surely, 2^20530312 is an apocalyptic number.

20530312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20530312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21450240).

20530312 is an abundant number, since it is smaller than the sum of its proper divisors (22370168).

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

20530312 is a wasteful number, since it uses less digits than its factorization.

20530312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20530312 is about 4531.0387330059. The cubic root of 20530312 is about 273.8200107278.

Adding to 20530312 its reverse (21303502), we get a palindrome (41833814).

The spelling of 20530312 in words is "twenty million, five hundred thirty thousand, three hundred twelve".