20566431 has 6 divisors (see below), whose sum is σ = 29707080. Its totient is φ = 13710948.

The previous prime is 20566409. The next prime is 20566453. The reversal of 20566431 is 13466502.

It is an interprime number because it is at equal distance from previous prime (20566409) and next prime (20566453).

It is not a de Polignac number, because 20566431 - 2⁶ = 20566367 is a prime.

It is a super-2 number, since 2×20566431² = 845956168155522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20566395 and 20566404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566331) 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, 1142571 + ... + 1142588.

It is an arithmetic number, because the mean of its divisors is an integer number (4951180).

Almost surely, 2^20566431 is an apocalyptic number.

20566431 is a deficient number, since it is larger than the sum of its proper divisors (9140649).

20566431 is a wasteful number, since it uses less digits than its factorization.

20566431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285165 (or 2285162 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20566431 is about 4535.0227121813. The cubic root of 20566431 is about 273.9804939317.

The spelling of 20566431 in words is "twenty million, five hundred sixty-six thousand, four hundred thirty-one".