20636231 has 8 divisors (see below), whose sum is σ = 25728384. Its totient is φ = 16080120.

The previous prime is 20636227. The next prime is 20636251. The reversal of 20636231 is 13263602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20636231 - 2² = 20636227 is a prime.

It is a super-2 number, since 2×20636231² = 851708059770722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20636197 and 20636206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636251) 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 7 ways as a sum of consecutive naturals, for example, 133925 + ... + 134078.

It is an arithmetic number, because the mean of its divisors is an integer number (3216048).

Almost surely, 2^20636231 is an apocalyptic number.

20636231 is a deficient number, since it is larger than the sum of its proper divisors (5092153).

20636231 is a wasteful number, since it uses less digits than its factorization.

20636231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268021.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20636231 is about 4542.7118552688. The cubic root of 20636231 is about 274.2900962557.

Adding to 20636231 its reverse (13263602), we get a palindrome (33899833).

The spelling of 20636231 in words is "twenty million, six hundred thirty-six thousand, two hundred thirty-one".