20366321 has 4 divisors (see below), whose sum is σ = 20380644. Its totient is φ = 20352000.

The previous prime is 20366303. The next prime is 20366327. The reversal of 20366321 is 12366302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19536400 + 829921 = 4420^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 20366321 - 2¹⁰ = 20365297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20366327) 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, 4760 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (5095161).

Almost surely, 2^20366321 is an apocalyptic number.

It is an amenable number.

20366321 is a deficient number, since it is larger than the sum of its proper divisors (14323).

20366321 is a wasteful number, since it uses less digits than its factorization.

20366321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14322.

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

The square root of 20366321 is about 4512.9060482133. The cubic root of 20366321 is about 273.0889922631.

The spelling of 20366321 in words is "twenty million, three hundred sixty-six thousand, three hundred twenty-one".