20617613 has 4 divisors (see below), whose sum is σ = 20817888. Its totient is φ = 20417340.

The previous prime is 20617607. The next prime is 20617627. The reversal of 20617613 is 31671602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20617613 - 2⁸ = 20617357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20617643) 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, 99983 + ... + 100188.

It is an arithmetic number, because the mean of its divisors is an integer number (5204472).

Almost surely, 2^20617613 is an apocalyptic number.

It is an amenable number.

20617613 is a deficient number, since it is larger than the sum of its proper divisors (200275).

20617613 is a wasteful number, since it uses less digits than its factorization.

20617613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200274.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20617613 is about 4540.6621763791. The cubic root of 20617613 is about 274.2075832951.

The spelling of 20617613 in words is "twenty million, six hundred seventeen thousand, six hundred thirteen".