20219717 has 4 divisors (see below), whose sum is σ = 23108256. Its totient is φ = 17331180.

The previous prime is 20219701. The next prime is 20219741. The reversal of 20219717 is 71791202.

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 20219717 - 2⁴ = 20219701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20219717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20219767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444259 + ... + 1444272.

It is an arithmetic number, because the mean of its divisors is an integer number (5777064).

Almost surely, 2^20219717 is an apocalyptic number.

It is an amenable number.

20219717 is a deficient number, since it is larger than the sum of its proper divisors (2888539).

20219717 is an equidigital number, since it uses as much as digits as its factorization.

20219717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888538.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 20219717 is about 4496.6339633108. The cubic root of 20219717 is about 272.4321498722.

The spelling of 20219717 in words is "twenty million, two hundred nineteen thousand, seven hundred seventeen".