20012231 has 4 divisors (see below), whose sum is σ = 20882352. Its totient is φ = 19142112.

The previous prime is 20012219. The next prime is 20012261. The reversal of 20012231 is 13221002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012231 is a prime.

It is a super-2 number, since 2×20012231² = 800978779194722, 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 (20012261) 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, 435026 + ... + 435071.

It is an arithmetic number, because the mean of its divisors is an integer number (5220588).

Almost surely, 2^20012231 is an apocalyptic number.

20012231 is a deficient number, since it is larger than the sum of its proper divisors (870121).

20012231 is an equidigital number, since it uses as much as digits as its factorization.

20012231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870120.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20012231 is about 4473.5032133665. The cubic root of 20012231 is about 271.4970837867.

Adding to 20012231 its reverse (13221002), we get a palindrome (33233233).

The spelling of 20012231 in words is "twenty million, twelve thousand, two hundred thirty-one".