20120231 has 16 divisors (see below), whose sum is σ = 21998304. Its totient is φ = 18330624.

The previous prime is 20120213. The next prime is 20120237. The reversal of 20120231 is 13202102.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20120231 is a prime.

It is a super-2 number, since 2×20120231² = 809647390986722, 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 (20120237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123356 + ... + 123518.

It is an arithmetic number, because the mean of its divisors is an integer number (1374894).

Almost surely, 2^20120231 is an apocalyptic number.

20120231 is a deficient number, since it is larger than the sum of its proper divisors (1878073).

20120231 is a wasteful number, since it uses less digits than its factorization.

20120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370.

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

The square root of 20120231 is about 4485.5580477796. The cubic root of 20120231 is about 271.9846039080.

Adding to 20120231 its reverse (13202102), we get a palindrome (33322333).

The spelling of 20120231 in words is "twenty million, one hundred twenty thousand, two hundred thirty-one".