20010215 has 4 divisors (see below), whose sum is σ = 24012264. Its totient is φ = 16008168.

The previous prime is 20010209. The next prime is 20010217. The reversal of 20010215 is 51201002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51201002 = 2 ⋅25600501.

It is a cyclic number.

It is not a de Polignac number, because 20010215 - 2²² = 15815911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010196 and 20010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010217) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2001017 + ... + 2001026.

It is an arithmetic number, because the mean of its divisors is an integer number (6003066).

Almost surely, 2^20010215 is an apocalyptic number.

20010215 is a deficient number, since it is larger than the sum of its proper divisors (4002049).

20010215 is an equidigital number, since it uses as much as digits as its factorization.

20010215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002048.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 20010215 is about 4473.2778809280. The cubic root of 20010215 is about 271.4879667539.

Adding to 20010215 its reverse (51201002), we get a palindrome (71211217).

The spelling of 20010215 in words is "twenty million, ten thousand, two hundred fifteen".