20150213 has 4 divisors (see below), whose sum is σ = 20208300. Its totient is φ = 20092128.

The previous prime is 20150197. The next prime is 20150227. The reversal of 20150213 is 31205102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8025889 + 12124324 = 2833^2 + 3482^2 .

It is a cyclic number.

It is not a de Polignac number, because 20150213 - 2⁴ = 20150197 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 (20150233) 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, 28520 + ... + 29217.

It is an arithmetic number, because the mean of its divisors is an integer number (5052075).

Almost surely, 2^20150213 is an apocalyptic number.

It is an amenable number.

20150213 is a deficient number, since it is larger than the sum of its proper divisors (58087).

20150213 is an equidigital number, since it uses as much as digits as its factorization.

20150213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58086.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20150213 is about 4488.8988627502. The cubic root of 20150213 is about 272.1196354130.

Adding to 20150213 its reverse (31205102), we get a palindrome (51355315).

The spelling of 20150213 in words is "twenty million, one hundred fifty thousand, two hundred thirteen".