20617331 has 4 divisors (see below), whose sum is σ = 23562672. Its totient is φ = 17671992.

The previous prime is 20617327. The next prime is 20617343. The reversal of 20617331 is 13371602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20617331 - 2² = 20617327 is a prime.

It is a super-2 number, since 2×20617331² = 850148675127122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20617297 and 20617306.

It is not an unprimeable number, because it can be changed into a prime (20617321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1472660 + ... + 1472673.

It is an arithmetic number, because the mean of its divisors is an integer number (5890668).

Almost surely, 2^20617331 is an apocalyptic number.

20617331 is a deficient number, since it is larger than the sum of its proper divisors (2945341).

20617331 is an equidigital number, since it uses as much as digits as its factorization.

20617331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945340.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 20617331 is about 4540.6311235334. The cubic root of 20617331 is about 274.2063331198.

Adding to 20617331 its reverse (13371602), we get a palindrome (33988933).

The spelling of 20617331 in words is "twenty million, six hundred seventeen thousand, three hundred thirty-one".