20009312 has 48 divisors (see below), whose sum is σ = 41023584. Its totient is φ = 9600000.

The previous prime is 20009293. The next prime is 20009329. The reversal of 20009312 is 21390002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132437 + ... + 132587.

It is an arithmetic number, because the mean of its divisors is an integer number (854658).

Almost surely, 2^20009312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20009312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20511792).

20009312 is an abundant number, since it is smaller than the sum of its proper divisors (21014272).

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

20009312 is a wasteful number, since it uses less digits than its factorization.

20009312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 20009312 is about 4473.1769470925. The cubic root of 20009312 is about 271.4838828844.

Adding to 20009312 its reverse (21390002), we get a palindrome (41399314).

The spelling of 20009312 in words is "twenty million, nine thousand, three hundred twelve".