20213365 has 4 divisors (see below), whose sum is σ = 24256044. Its totient is φ = 16170688.

The previous prime is 20213353. The next prime is 20213399. The reversal of 20213365 is 56331202.

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 15311569 + 4901796 = 3913^2 + 2214^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213365 - 2⁹ = 20212853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021332 + ... + 2021341.

It is an arithmetic number, because the mean of its divisors is an integer number (6064011).

Almost surely, 2^20213365 is an apocalyptic number.

It is an amenable number.

20213365 is a deficient number, since it is larger than the sum of its proper divisors (4042679).

20213365 is an equidigital number, since it uses as much as digits as its factorization.

20213365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042678.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20213365 is about 4495.9276017303. The cubic root of 20213365 is about 272.4036188059.

Adding to 20213365 its reverse (56331202), we get a palindrome (76544567).

The spelling of 20213365 in words is "twenty million, two hundred thirteen thousand, three hundred sixty-five".