20630215 has 4 divisors (see below), whose sum is σ = 24756264. Its totient is φ = 16504168.

The previous prime is 20630213. The next prime is 20630243. The reversal of 20630215 is 51203602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51203602 = 2 ⋅25601801.

It is a cyclic number.

It is not a de Polignac number, because 20630215 - 2¹ = 20630213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20630192 and 20630201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630213) 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, 2063017 + ... + 2063026.

It is an arithmetic number, because the mean of its divisors is an integer number (6189066).

Almost surely, 2^20630215 is an apocalyptic number.

20630215 is a deficient number, since it is larger than the sum of its proper divisors (4126049).

20630215 is an equidigital number, since it uses as much as digits as its factorization.

20630215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126048.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20630215 is about 4542.0496474609. The cubic root of 20630215 is about 274.2634394243.

Adding to 20630215 its reverse (51203602), we get a palindrome (71833817).

The spelling of 20630215 in words is "twenty million, six hundred thirty thousand, two hundred fifteen".