20150231 has 4 divisors (see below), whose sum is σ = 21026352. Its totient is φ = 19274112.

The previous prime is 20150227. The next prime is 20150233. The reversal of 20150231 is 13205102.

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: 13205102 = 2 ⋅6602551.

It is a cyclic number.

It is not a de Polignac number, because 20150231 - 2² = 20150227 is a prime.

It is a super-2 number, since 2×20150231² = 812063618706722, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438026 + ... + 438071.

It is an arithmetic number, because the mean of its divisors is an integer number (5256588).

Almost surely, 2^20150231 is an apocalyptic number.

20150231 is a deficient number, since it is larger than the sum of its proper divisors (876121).

20150231 is an equidigital number, since it uses as much as digits as its factorization.

20150231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876120.

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

The square root of 20150231 is about 4488.9008676958. The cubic root of 20150231 is about 272.1197164403.

Adding to 20150231 its reverse (13205102), we get a palindrome (33355333).

The spelling of 20150231 in words is "twenty million, one hundred fifty thousand, two hundred thirty-one".