20568231 has 6 divisors (see below), whose sum is σ = 29709680. Its totient is φ = 13712148.

The previous prime is 20568227. The next prime is 20568253. The reversal of 20568231 is 13286502.

It is not a de Polignac number, because 20568231 - 2² = 20568227 is a prime.

It is a super-2 number, since 2×20568231² = 846104252938722, 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 = 20568195 and 20568204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20568211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1142671 + ... + 1142688.

Almost surely, 2^20568231 is an apocalyptic number.

20568231 is a deficient number, since it is larger than the sum of its proper divisors (9141449).

20568231 is a wasteful number, since it uses less digits than its factorization.

20568231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285365 (or 2285362 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20568231 is about 4535.2211632951. The cubic root of 20568231 is about 273.9884867381.

The spelling of 20568231 in words is "twenty million, five hundred sixty-eight thousand, two hundred thirty-one".