20000215 has 4 divisors (see below), whose sum is σ = 24000264. Its totient is φ = 16000168.

The previous prime is 20000213. The next prime is 20000221. The reversal of 20000215 is 51200002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20000215 - 2¹ = 20000213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000213) 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, 2000017 + ... + 2000026.

It is an arithmetic number, because the mean of its divisors is an integer number (6000066).

Almost surely, 2^20000215 is an apocalyptic number.

20000215 is a deficient number, since it is larger than the sum of its proper divisors (4000049).

20000215 is an equidigital number, since it uses as much as digits as its factorization.

20000215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000048.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20000215 is about 4472.1599926657. The cubic root of 20000215 is about 271.4427343223.

Adding to 20000215 its reverse (51200002), we get a palindrome (71200217).

The spelling of 20000215 in words is "twenty million, two hundred fifteen", and thus it is an aban number.