20366231 has 4 divisors (see below), whose sum is σ = 20393352. Its totient is φ = 20339112.

The previous prime is 20366183. The next prime is 20366237. The reversal of 20366231 is 13266302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20366231 is a prime.

It is a super-2 number, since 2×20366231² = 829566730290722, 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 = 20366197 and 20366206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20366237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12401 + ... + 13946.

It is an arithmetic number, because the mean of its divisors is an integer number (5098338).

Almost surely, 2^20366231 is an apocalyptic number.

20366231 is a deficient number, since it is larger than the sum of its proper divisors (27121).

20366231 is an equidigital number, since it uses as much as digits as its factorization.

20366231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27120.

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

The square root of 20366231 is about 4512.8960768004. The cubic root of 20366231 is about 273.0885899969.

The spelling of 20366231 in words is "twenty million, three hundred sixty-six thousand, two hundred thirty-one".