20613265 has 8 divisors (see below), whose sum is σ = 26191080. Its totient is φ = 15520512.

The previous prime is 20613253. The next prime is 20613269. The reversal of 20613265 is 56231602.

It can be written as a sum of positive squares in 4 ways, for example, as 5798464 + 14814801 = 2408^2 + 3849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20613265 - 2¹³ = 20605073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20613269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121170 + ... + 121339.

It is an arithmetic number, because the mean of its divisors is an integer number (3273885).

Almost surely, 2^20613265 is an apocalyptic number.

It is an amenable number.

20613265 is a deficient number, since it is larger than the sum of its proper divisors (5577815).

20613265 is a wasteful number, since it uses less digits than its factorization.

20613265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242531.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20613265 is about 4540.1833663411. The cubic root of 20613265 is about 274.1883062755.

Adding to 20613265 its reverse (56231602), we get a palindrome (76844867).

The spelling of 20613265 in words is "twenty million, six hundred thirteen thousand, two hundred sixty-five".