20001365 has 4 divisors (see below), whose sum is σ = 24001644. Its totient is φ = 16001088.

The previous prime is 20001361. The next prime is 20001389. The reversal of 20001365 is 56310002.

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 14577124 + 5424241 = 3818^2 + 2329^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001365 - 2² = 20001361 is a prime.

It is a Duffinian number.

20001365 is a modest number, since divided by 1365 gives 20 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000132 + ... + 2000141.

It is an arithmetic number, because the mean of its divisors is an integer number (6000411).

Almost surely, 2^20001365 is an apocalyptic number.

It is an amenable number.

20001365 is a deficient number, since it is larger than the sum of its proper divisors (4000279).

20001365 is an equidigital number, since it uses as much as digits as its factorization.

20001365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000278.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20001365 is about 4472.2885640352. The cubic root of 20001365 is about 271.4479368191.

Adding to 20001365 its reverse (56310002), we get a palindrome (76311367).

The spelling of 20001365 in words is "twenty million, one thousand, three hundred sixty-five".