20348617 has 4 divisors (see below), whose sum is σ = 21005056. Its totient is φ = 19692180.

The previous prime is 20348611. The next prime is 20348621. The reversal of 20348617 is 71684302.

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 a de Polignac number, because none of the positive numbers 2^k-20348617 is a prime.

It is a super-3 number, since 3×20348617³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 656407 = 20348617 / (2 + 0 + 3 + 4 + 8 + 6 + 1 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20348611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328173 + ... + 328234.

It is an arithmetic number, because the mean of its divisors is an integer number (5251264).

Almost surely, 2^20348617 is an apocalyptic number.

It is an amenable number.

20348617 is a deficient number, since it is larger than the sum of its proper divisors (656439).

20348617 is an equidigital number, since it uses as much as digits as its factorization.

20348617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656438.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20348617 is about 4510.9441362092. The cubic root of 20348617 is about 273.0098392157.

The spelling of 20348617 in words is "twenty million, three hundred forty-eight thousand, six hundred seventeen".