20492717 has 4 divisors (see below), whose sum is σ = 23420256. Its totient is φ = 17565180.

The previous prime is 20492711. The next prime is 20492729. The reversal of 20492717 is 71729402.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71729402 = 2 ⋅35864701.

It is a cyclic number.

It is not a de Polignac number, because 20492717 - 2⁶ = 20492653 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 (20492711) 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, 1463759 + ... + 1463772.

It is an arithmetic number, because the mean of its divisors is an integer number (5855064).

Almost surely, 2^20492717 is an apocalyptic number.

It is an amenable number.

20492717 is a deficient number, since it is larger than the sum of its proper divisors (2927539).

20492717 is an equidigital number, since it uses as much as digits as its factorization.

20492717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927538.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 20492717 is about 4526.8882248185. Note that the first 3 decimals coincide. The cubic root of 20492717 is about 273.6527693450.

The spelling of 20492717 in words is "twenty million, four hundred ninety-two thousand, seven hundred seventeen".