20201215 has 8 divisors (see below), whose sum is σ = 24699168. Its totient is φ = 15855840.

The previous prime is 20201191. The next prime is 20201227. The reversal of 20201215 is 51210202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20201215 - 2⁵ = 20201183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201195 and 20201204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37851 + ... + 38380.

It is an arithmetic number, because the mean of its divisors is an integer number (3087396).

Almost surely, 2^20201215 is an apocalyptic number.

20201215 is a deficient number, since it is larger than the sum of its proper divisors (4497953).

20201215 is an equidigital number, since it uses as much as digits as its factorization.

20201215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76289.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20201215 is about 4494.5761757923. The cubic root of 20201215 is about 272.3490284011.

Adding to 20201215 its reverse (51210202), we get a palindrome (71411417).

The spelling of 20201215 in words is "twenty million, two hundred one thousand, two hundred fifteen".