20305372 has 12 divisors (see below), whose sum is σ = 36680896. Its totient is φ = 9825120.

The previous prime is 20305367. The next prime is 20305379. The reversal of 20305372 is 27350302.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81753 + ... + 82000.

Almost surely, 2^20305372 is an apocalyptic number.

It is an amenable number.

20305372 is a deficient number, since it is larger than the sum of its proper divisors (16375524).

20305372 is a wasteful number, since it uses less digits than its factorization.

20305372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163788 (or 163786 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 22.

The square root of 20305372 is about 4506.1482443435. The cubic root of 20305372 is about 272.8163013453.

Adding to 20305372 its reverse (27350302), we get a palindrome (47655674).

The spelling of 20305372 in words is "twenty million, three hundred five thousand, three hundred seventy-two".