20106231 has 12 divisors (see below), whose sum is σ = 27232632. Its totient is φ = 13195248.

The previous prime is 20106227. The next prime is 20106253. The reversal of 20106231 is 13260102.

It is not a de Polignac number, because 20106231 - 2² = 20106227 is a prime.

It is a super-2 number, since 2×20106231² = 808521050050722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20106231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20126231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12721 + ... + 14213.

It is an arithmetic number, because the mean of its divisors is an integer number (2269386).

Almost surely, 2^20106231 is an apocalyptic number.

20106231 is a deficient number, since it is larger than the sum of its proper divisors (7126401).

20106231 is an equidigital number, since it uses as much as digits as its factorization.

20106231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630 (or 1563 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20106231 is about 4483.9972123096. The cubic root of 20106231 is about 271.9215054281.

Adding to 20106231 its reverse (13260102), we get a palindrome (33366333).

The spelling of 20106231 in words is "twenty million, one hundred six thousand, two hundred thirty-one".