20615212 has 12 divisors (see below), whose sum is σ = 36340920. Its totient is φ = 10232096.

The previous prime is 20615207. The next prime is 20615213. The reversal of 20615212 is 21251602.

It is a self number, because there is not a number n which added to its sum of digits gives 20615212.

It is not an unprimeable number, because it can be changed into a prime (20615213) 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, 18262 + ... + 19357.

It is an arithmetic number, because the mean of its divisors is an integer number (3028410).

Almost surely, 2^20615212 is an apocalyptic number.

It is an amenable number.

20615212 is a deficient number, since it is larger than the sum of its proper divisors (15725708).

20615212 is a wasteful number, since it uses less digits than its factorization.

20615212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37760 (or 37758 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20615212 is about 4540.3977799307. The cubic root of 20615212 is about 274.1969387075.

Adding to 20615212 its reverse (21251602), we get a palindrome (41866814).

The spelling of 20615212 in words is "twenty million, six hundred fifteen thousand, two hundred twelve".