20011215 has 16 divisors (see below), whose sum is σ = 36592128. Its totient is φ = 9147936.

The previous prime is 20011177. The next prime is 20011249. The reversal of 20011215 is 51211002.

It is not a de Polignac number, because 20011215 - 2⁷ = 20011087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95187 + ... + 95396.

It is an arithmetic number, because the mean of its divisors is an integer number (2287008).

Almost surely, 2^20011215 is an apocalyptic number.

20011215 is a deficient number, since it is larger than the sum of its proper divisors (16580913).

20011215 is a wasteful number, since it uses less digits than its factorization.

20011215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190598.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 20011215 is about 4473.3896543896. The cubic root of 20011215 is about 271.4924891681.

Adding to 20011215 its reverse (51211002), we get a palindrome (71222217).

The spelling of 20011215 in words is "twenty million, eleven thousand, two hundred fifteen".