20717613 has 40 divisors (see below), whose sum is σ = 36009600. Its totient is φ = 11625120.

The previous prime is 20717603. The next prime is 20717633. The reversal of 20717613 is 31671702.

It is not a de Polignac number, because 20717613 - 2⁴ = 20717597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717603) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34288 + ... + 34886.

It is an arithmetic number, because the mean of its divisors is an integer number (900240).

Almost surely, 2^20717613 is an apocalyptic number.

It is an amenable number.

20717613 is a deficient number, since it is larger than the sum of its proper divisors (15291987).

20717613 is an equidigital number, since it uses as much as digits as its factorization.

20717613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 20717613 is about 4551.6604662475. The cubic root of 20717613 is about 274.6501910329.

The spelling of 20717613 in words is "twenty million, seven hundred seventeen thousand, six hundred thirteen".