20004215 has 32 divisors (see below), whose sum is σ = 30191616. Its totient is φ = 12360960.

The previous prime is 20004211. The next prime is 20004217. The reversal of 20004215 is 51240002.

It is not a de Polignac number, because 20004215 - 2² = 20004211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20004215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85739 + ... + 85971.

It is an arithmetic number, because the mean of its divisors is an integer number (943488).

Almost surely, 2^20004215 is an apocalyptic number.

20004215 is a deficient number, since it is larger than the sum of its proper divisors (10187401).

20004215 is a wasteful number, since it uses less digits than its factorization.

20004215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20004215 is about 4472.6071814994. The cubic root of 20004215 is about 271.4608291038.

Adding to 20004215 its reverse (51240002), we get a palindrome (71244217).

The spelling of 20004215 in words is "twenty million, four thousand, two hundred fifteen".