20617131 has 8 divisors (see below), whose sum is σ = 28684800. Its totient is φ = 13147112.

The previous prime is 20617127. The next prime is 20617133. The reversal of 20617131 is 13171602.

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 20617131 - 2² = 20617127 is a prime.

It is a super-2 number, since 2×20617131² = 850132181342322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20617098 and 20617107.

It is not an unprimeable number, because it can be changed into a prime (20617133) 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, 149331 + ... + 149468.

It is an arithmetic number, because the mean of its divisors is an integer number (3585600).

Almost surely, 2^20617131 is an apocalyptic number.

20617131 is a deficient number, since it is larger than the sum of its proper divisors (8067669).

20617131 is a wasteful number, since it uses less digits than its factorization.

20617131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298825.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20617131 is about 4540.6091001098. The cubic root of 20617131 is about 274.2054464638.

Adding to 20617131 its reverse (13171602), we get a palindrome (33788733).

The spelling of 20617131 in words is "twenty million, six hundred seventeen thousand, one hundred thirty-one".