20305212 has 24 divisors (see below), whose sum is σ = 47980800. Its totient is φ = 6682416.

The previous prime is 20305211. The next prime is 20305213. The reversal of 20305212 is 21250302.

It is an interprime number because it is at equal distance from previous prime (20305211) and next prime (20305213).

It is a junction number, because it is equal to n+sod(n) for n = 20305191 and 20305200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9762 + ... + 11657.

It is an arithmetic number, because the mean of its divisors is an integer number (1999200).

Almost surely, 2^20305212 is an apocalyptic number.

It is an amenable number.

20305212 is an abundant number, since it is smaller than the sum of its proper divisors (27675588).

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

20305212 is a wasteful number, since it uses less digits than its factorization.

20305212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21505 (or 21503 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20305212 is about 4506.1304907870. The cubic root of 20305212 is about 272.8155847743.

Adding to 20305212 its reverse (21250302), we get a palindrome (41555514).

The spelling of 20305212 in words is "twenty million, three hundred five thousand, two hundred twelve".