20863231 has 6 divisors (see below), whose sum is σ = 21810320. Its totient is φ = 19955628.

The previous prime is 20863229. The next prime is 20863247. The reversal of 20863231 is 13236802.

It is not a de Polignac number, because 20863231 - 2¹ = 20863229 is a prime.

It is a super-2 number, since 2×20863231² = 870548815518722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20863196 and 20863205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20863631) 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 5 ways as a sum of consecutive naturals, for example, 19191 + ... + 20248.

Almost surely, 2^20863231 is an apocalyptic number.

20863231 is a deficient number, since it is larger than the sum of its proper divisors (947089).

20863231 is an equidigital number, since it uses as much as digits as its factorization.

20863231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39485 (or 39462 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20863231 is about 4567.6285969855. The cubic root of 20863231 is about 275.2921677198.

The spelling of 20863231 in words is "twenty million, eight hundred sixty-three thousand, two hundred thirty-one".